comparative essay methods

Comparative Essay Writing: Methods and Examples

| Danielle McLeod

Danielle McLeod

Danielle McLeod is a highly qualified secondary English Language Arts Instructor who brings a diverse educational background to her classroom. With degrees in science, English, and literacy, she has worked to create cross-curricular materials to bridge learning gaps and help students focus on effective writing and speech techniques. Currently working as a dual credit technical writing instructor at a Career and Technical Education Center, her curriculum development surrounds student focus on effective communication for future career choices.

Writing effective comparative essays requires strategic techniques and thoughtful consideration of common pitfalls. A comparative essay explores the similarities and differences between subjects, allowing the writer to draw conclusions related to the topics of the material.

This article outlines key strategies, such as using transitions, incorporating evidence, and maintaining a formal tone. It also identifies mistakes to avoid, like failing to establish a clear basis for comparison or providing a superficial analysis.

The article emphasizes the importance of revising your comparative essay. This process enables you to refine your analysis, strengthen your arguments, and enhance the overall quality of your work. Incorporating feedback from peers or instructors can elevate your comparative essay and communicate your unique insights more effectively.

Whether you are a student or a professional writer, this guidance can help you craft comparative essays that captivate and inform your audience. Let’s explore the essentials of comparative analysis to enhance your writing prowess.

What is a Comparative Essay?

A comparative essay is a form of academic writing that examines and analyzes two or more subjects, identifying their similarities and differences. This type of essay allows students to develop critical thinking skills by evaluating and contrasting various topic elements. 

For example, a comparative analysis of the Roman Empire and the Aztec Empire might make a good history class topic. In contrast, a comparative study of the Harlem Renaissance and the Chicano Art Movement would make a good art class focus. 

Types of Comparative Methods

There are two main methods of structuring a comparative essay: the block method and the point-by-point method.

Block Method

• In the block method , you discuss each subject separately.
• You spend one or more paragraphs focusing on the first subject, then move on to the second subject.
• This allows you to go into more detail about each subject before comparing.
• The block method is good when the subjects you’re comparing have many differences or when you want to establish a strong foundation for your comparison.

Point-by-Point Method

• The point-by-point method jumps back and forth between the two subjects.
• In each paragraph, you address a specific point of comparison or contrast between the subjects.
• This structure encourages you to compare the subjects directly, clearly highlighting their similarities and differences.
• The point-by-point method works well when the subjects share clear, significant points of comparison, allowing you to explore their differences and similarities efficiently.

Why are Comparative Essays Important?

Comparative essays are an important part of academic writing because they encourage students to engage in deeper analysis, identify meaningful connections, and better understand the subjects being explored. 

By comparing and contrasting different concepts, ideas, or phenomena, students can develop a well-rounded perspective and strengthen their ability to think critically.

What Should You Consider When Selecting Topics for Comparison?

When choosing topics for a comparative essay, it’s important to select subjects with some common ground but distinct differences. This will allow you to conduct a meaningful analysis and draw insightful conclusions. Consider factors such as the subjects’ historical context, cultural influences, or underlying themes to ensure a productive comparison.

For example, using the Block Method, you might do the following;

• Comparing the education systems in the United States and Canada
• Analyzing the differences between classic literature and modern young adult novels
• Contrasting the architectural styles of Gothic cathedrals and Renaissance palaces

In a block method essay on these topics, the writer would devote one or more paragraphs to thoroughly describing and analyzing the first subject (e.g., the US education system, classic literature, Gothic cathedrals) before moving on to discuss the second subject (e.g., the Canadian education system, young adult novels, Renaissance palaces). This would allow the reader to fully understand each topic before the comparative analysis is presented.

Using the Point-by-Point Method might be best used with these topics:

• Comparing the use of symbolism in Ernest Hemingway’s “The Old Man and the Sea” and F. Scott Fitzgerald’s “The Great Gatsby.”
• Contrasting the political ideologies of Abraham Lincoln and Theodore Roosevelt
• Analyzing the similarities and differences in the marketing strategies of Coca-Cola and Pepsi

In a point-by-point comparative essay, the writer would alternate between the two subjects in each paragraph, directly comparing and contrasting specific elements (e.g., how symbolism is used, political views, and marketing tactics). This would encourage a more integrated analysis of the similarities and differences between the subjects.

How Can You Brainstorm for a Comparative Essay?

To begin brainstorming for a comparative essay, start by creating a Venn diagram to visually organize the similarities and differences between your chosen topics. This can help you identify key points of comparison and contrast, which will form the foundation of your essay. 

Additionally, consider writing down any questions or observations that arise during this process, as they may guide your subsequent research and analysis.

How Should You Formulate a Thesis Statement for a Comparative Essay?

A thesis statement is a one- or two-sentence summary that conveys a comparative essay’s main argument, focus, or purpose. It provides the reader with an overview of the essay’s central claim, which the rest of the paper will work to develop and support.

Your comparative essay’s thesis statement should clearly explain the central argument or insight that your analysis will explore. This statement should go beyond simply identifying the subjects being compared and instead make a substantive claim about the relationship between them. A strong comparative essay thesis will establish the basis for your comparative analysis and provide a roadmap for the rest of your essay.

For example, using the examples mentioned above, consider these options:

• “Classic literature and modern young adult novels differ greatly in their thematic depth, complexity of characterization, and use of literary devices, though both genres can provide valuable insights into the human experience.”
• “Gothic cathedrals and Renaissance palaces represent vastly contrasting architectural styles, with Gothic structures emphasizing verticality, pointed arches, and religious symbolism, while Renaissance palaces showcase classical proportions, ornate facades, and secular grandeur.”
• “Ernest Hemingway’s ‘The Old Man and the Sea’ and F. Scott Fitzgerald’s ‘The Great Gatsby’ both employ symbolic imagery to explore themes of the human condition, but they do so in strikingly different ways that reflect the author’s distinct writing styles and philosophical perspectives.”
• “Though Abraham Lincoln and Theodore Roosevelt held vastly different political ideologies, with Lincoln championing a strong federal government and Roosevelt advocating for a more progressive, regulatory approach, both presidents played pivotal roles in shaping the course of American history.”

What Strategies Should You Employ When Writing Comparative Essays?

When writing a comparative essay, it’s important to employ various strategies to effectively communicate your analysis. This may include using transition words and phrases to establish connections between ideas, incorporating relevant examples or evidence to support your claims, and maintaining a formal, academic tone throughout your writing. 

Additionally, consider incorporating a Venn diagram or other visual aids to enhance your comparative analysis.

Strategies for Comparative Essays

To recap, use the following strategies in your work to help organize and structure your essay: 

Use Effective Transitions

• Words/phrases like “in contrast,” “on the other hand,” “similarly,” “conversely,” etc.
• Help establish clear connections between ideas and comparisons.

Provide Relevant Examples and Evidence

• Draw from the subjects being compared to support your claims
• Use specific details, quotes, or data to strengthen your analysis

Maintain a Formal, Academic Tone

• Avoid casual or conversational language
• Focus on objective, analytical writing

Incorporate Visual Aids (if appropriate)

• Venn diagrams, tables, or other graphics can effectively illustrate comparisons
• Help the reader visualize the relationships between the subjects

Structure Logically

• Use either the block method or point-by-point organization
• Ensure a clear, coherent flow of ideas

Address Counterarguments or Limitations

• Acknowledge and respond to potential objections or alternative perspectives.
• Demonstrates depth of understanding

Which Mistakes Should You Be Careful of in Comparative Essay Writing?

Here are some examples to illustrate the common mistakes to avoid when writing comparative essays:

Failing to establish a clear basis for comparison

• Attempting to compare the plot of a novel to the musical score of an opera without explaining the relevance of that comparison
• Contrasting two political ideologies without defining the key criteria being used to evaluate them

Neglecting to address significant differences or similarities

• Comparing the leadership styles of two presidents but failing to discuss their differing approaches to domestic or foreign policy
• Analyzing the architectural features of Gothic cathedrals and Renaissance palaces without acknowledging their shared use of symmetry and classical proportions

Providing a superficial or unbalanced analysis

• Dedicating a single paragraph to analyzing the complex socioeconomic factors that shaped the development of two education systems
• The majority of the essay focused on the differences between the two subjects while only briefly mentioning their similarities.

Relying too heavily on plot summary or description

• Retelling the narratives of two novels in detail without delving into a comparative analysis of their themes, character development, or stylistic elements
• Extensively describing the physical attributes of two historical buildings without explaining how those features reflect the broader architectural movements.

Lacking a cohesive and logical organizational structure

• Jumping back and forth between discussing the two subjects without a clear basis for the order or flow of ideas
• Using the block method but failing to create a smooth transition between the sections devoted to each subject

Incorporating specific, relevant examples for each of these potential pitfalls can help illustrate the importance of avoiding them in comparative essay writing. These tips can help you when you just wish you could ask something to “ write my essay for me .”

Why is Revising Your Comparative Essay Crucial?

Revising your comparative essay is always considered an important step in the writing process, as it allows you to refine your analysis, strengthen your arguments, and ensure the overall explanation of connections and effectiveness of your essay. 

During the revision stage, consider seeking feedback from peers or instructors. Their perspectives can help you identify areas for improvement and enhance the quality of your comparative essay.

Reasons to Revise Comparative Essays

Refine Your Analysis

• Example: Upon revision, you realize your comparison of two political ideologies lacks nuance and fails to acknowledge the complexities within each position. You then expand your analysis to provide a more nuanced and balanced perspective.

Strengthen Your Arguments

• Example: During revision, you identify gaps in your supporting evidence for a key point contrasting the marketing strategies of two rival companies. You then incorporate additional data and examples to bolster your comparative claims.

Ensure Coherence and Organization

• Example: In reviewing your essay, you recognize that your use of the point-by-point method is causing your comparisons to feel disjointed. You then reorganize your essay to follow a more cohesive block structure, improving the overall flow of ideas.

Incorporate Peer/Instructor Feedback

• Example: After receiving feedback from your instructor, you realize your comparison of two literary works does not adequately address a significant thematic similarity. You then revise the essay to incorporate this overlooked element into your analysis.

Enhance the Overall Quality

• Example: During the revision process, you identify opportunities to improve the clarity and precision of your language, ensuring your comparative essay communicates your insights effectively to the reader.

A comparative essay is a valuable academic writing exercise that encourages critical thinking, in-depth analysis, and the development of essential written communication skills. By mastering the structure, thesis formulation, and writing strategies associated with comparative essays, students can enhance their ability to engage in thoughtful, well-reasoned comparisons and effectively convey their research, discoveries, and opinions to their audience.

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• Comparing and contrasting in an essay | Tips & examples

Comparing and Contrasting in an Essay | Tips & Examples

Published on August 6, 2020 by Jack Caulfield . Revised on July 23, 2023.

Comparing and contrasting is an important skill in academic writing . It involves taking two or more subjects and analyzing the differences and similarities between them.

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Table of contents

When should i compare and contrast, making effective comparisons, comparing and contrasting as a brainstorming tool, structuring your comparisons, other interesting articles, frequently asked questions about comparing and contrasting.

Many assignments will invite you to make comparisons quite explicitly, as in these prompts.

• Compare the treatment of the theme of beauty in the poetry of William Wordsworth and John Keats.
• Compare and contrast in-class and distance learning. What are the advantages and disadvantages of each approach?

Some other prompts may not directly ask you to compare and contrast, but present you with a topic where comparing and contrasting could be a good approach.

One way to approach this essay might be to contrast the situation before the Great Depression with the situation during it, to highlight how large a difference it made.

Comparing and contrasting is also used in all kinds of academic contexts where it’s not explicitly prompted. For example, a literature review involves comparing and contrasting different studies on your topic, and an argumentative essay may involve weighing up the pros and cons of different arguments.

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As the name suggests, comparing and contrasting is about identifying both similarities and differences. You might focus on contrasting quite different subjects or comparing subjects with a lot in common—but there must be some grounds for comparison in the first place.

For example, you might contrast French society before and after the French Revolution; you’d likely find many differences, but there would be a valid basis for comparison. However, if you contrasted pre-revolutionary France with Han-dynasty China, your reader might wonder why you chose to compare these two societies.

This is why it’s important to clarify the point of your comparisons by writing a focused thesis statement . Every element of an essay should serve your central argument in some way. Consider what you’re trying to accomplish with any comparisons you make, and be sure to make this clear to the reader.

Comparing and contrasting can be a useful tool to help organize your thoughts before you begin writing any type of academic text. You might use it to compare different theories and approaches you’ve encountered in your preliminary research, for example.

Let’s say your research involves the competing psychological approaches of behaviorism and cognitive psychology. You might make a table to summarize the key differences between them.

Or say you’re writing about the major global conflicts of the twentieth century. You might visualize the key similarities and differences in a Venn diagram.

These visualizations wouldn’t make it into your actual writing, so they don’t have to be very formal in terms of phrasing or presentation. The point of comparing and contrasting at this stage is to help you organize and shape your ideas to aid you in structuring your arguments.

When comparing and contrasting in an essay, there are two main ways to structure your comparisons: the alternating method and the block method.

The alternating method

In the alternating method, you structure your text according to what aspect you’re comparing. You cover both your subjects side by side in terms of a specific point of comparison. Your text is structured like this:

Mouse over the example paragraph below to see how this approach works.

One challenge teachers face is identifying and assisting students who are struggling without disrupting the rest of the class. In a traditional classroom environment, the teacher can easily identify when a student is struggling based on their demeanor in class or simply by regularly checking on students during exercises. They can then offer assistance quietly during the exercise or discuss it further after class. Meanwhile, in a Zoom-based class, the lack of physical presence makes it more difficult to pay attention to individual students’ responses and notice frustrations, and there is less flexibility to speak with students privately to offer assistance. In this case, therefore, the traditional classroom environment holds the advantage, although it appears likely that aiding students in a virtual classroom environment will become easier as the technology, and teachers’ familiarity with it, improves.

The block method

In the block method, you cover each of the overall subjects you’re comparing in a block. You say everything you have to say about your first subject, then discuss your second subject, making comparisons and contrasts back to the things you’ve already said about the first. Your text is structured like this:

• Point of comparison A
• Point of comparison B

The most commonly cited advantage of distance learning is the flexibility and accessibility it offers. Rather than being required to travel to a specific location every week (and to live near enough to feasibly do so), students can participate from anywhere with an internet connection. This allows not only for a wider geographical spread of students but for the possibility of studying while travelling. However, distance learning presents its own accessibility challenges; not all students have a stable internet connection and a computer or other device with which to participate in online classes, and less technologically literate students and teachers may struggle with the technical aspects of class participation. Furthermore, discomfort and distractions can hinder an individual student’s ability to engage with the class from home, creating divergent learning experiences for different students. Distance learning, then, seems to improve accessibility in some ways while representing a step backwards in others.

Note that these two methods can be combined; these two example paragraphs could both be part of the same essay, but it’s wise to use an essay outline to plan out which approach you’re taking in each paragraph.

If you want to know more about AI tools , college essays , or fallacies make sure to check out some of our other articles with explanations and examples or go directly to our tools!

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Some essay prompts include the keywords “compare” and/or “contrast.” In these cases, an essay structured around comparing and contrasting is the appropriate response.

Comparing and contrasting is also a useful approach in all kinds of academic writing : You might compare different studies in a literature review , weigh up different arguments in an argumentative essay , or consider different theoretical approaches in a theoretical framework .

Your subjects might be very different or quite similar, but it’s important that there be meaningful grounds for comparison . You can probably describe many differences between a cat and a bicycle, but there isn’t really any connection between them to justify the comparison.

You’ll have to write a thesis statement explaining the central point you want to make in your essay , so be sure to know in advance what connects your subjects and makes them worth comparing.

Comparisons in essays are generally structured in one of two ways:

• The alternating method, where you compare your subjects side by side according to one specific aspect at a time.
• The block method, where you cover each subject separately in its entirety.

It’s also possible to combine both methods, for example by writing a full paragraph on each of your topics and then a final paragraph contrasting the two according to a specific metric.

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Comparing and Contrasting

What this handout is about.

This handout will help you first to determine whether a particular assignment is asking for comparison/contrast and then to generate a list of similarities and differences, decide which similarities and differences to focus on, and organize your paper so that it will be clear and effective. It will also explain how you can (and why you should) develop a thesis that goes beyond “Thing A and Thing B are similar in many ways but different in others.”

Introduction

In your career as a student, you’ll encounter many different kinds of writing assignments, each with its own requirements. One of the most common is the comparison/contrast essay, in which you focus on the ways in which certain things or ideas—usually two of them—are similar to (this is the comparison) and/or different from (this is the contrast) one another. By assigning such essays, your instructors are encouraging you to make connections between texts or ideas, engage in critical thinking, and go beyond mere description or summary to generate interesting analysis: when you reflect on similarities and differences, you gain a deeper understanding of the items you are comparing, their relationship to each other, and what is most important about them.

Recognizing comparison/contrast in assignments

Some assignments use words—like compare, contrast, similarities, and differences—that make it easy for you to see that they are asking you to compare and/or contrast. Here are a few hypothetical examples:

• Compare and contrast Frye’s and Bartky’s accounts of oppression.
• Compare WWI to WWII, identifying similarities in the causes, development, and outcomes of the wars.
• Contrast Wordsworth and Coleridge; what are the major differences in their poetry?

Notice that some topics ask only for comparison, others only for contrast, and others for both.

But it’s not always so easy to tell whether an assignment is asking you to include comparison/contrast. And in some cases, comparison/contrast is only part of the essay—you begin by comparing and/or contrasting two or more things and then use what you’ve learned to construct an argument or evaluation. Consider these examples, noticing the language that is used to ask for the comparison/contrast and whether the comparison/contrast is only one part of a larger assignment:

• Choose a particular idea or theme, such as romantic love, death, or nature, and consider how it is treated in two Romantic poems.
• How do the different authors we have studied so far define and describe oppression?
• Compare Frye’s and Bartky’s accounts of oppression. What does each imply about women’s collusion in their own oppression? Which is more accurate?
• In the texts we’ve studied, soldiers who served in different wars offer differing accounts of their experiences and feelings both during and after the fighting. What commonalities are there in these accounts? What factors do you think are responsible for their differences?

You may want to check out our handout on understanding assignments for additional tips.

Using comparison/contrast for all kinds of writing projects

Sometimes you may want to use comparison/contrast techniques in your own pre-writing work to get ideas that you can later use for an argument, even if comparison/contrast isn’t an official requirement for the paper you’re writing. For example, if you wanted to argue that Frye’s account of oppression is better than both de Beauvoir’s and Bartky’s, comparing and contrasting the main arguments of those three authors might help you construct your evaluation—even though the topic may not have asked for comparison/contrast and the lists of similarities and differences you generate may not appear anywhere in the final draft of your paper.

Discovering similarities and differences

Making a Venn diagram or a chart can help you quickly and efficiently compare and contrast two or more things or ideas. To make a Venn diagram, simply draw some overlapping circles, one circle for each item you’re considering. In the central area where they overlap, list the traits the two items have in common. Assign each one of the areas that doesn’t overlap; in those areas, you can list the traits that make the things different. Here’s a very simple example, using two pizza places:

To make a chart, figure out what criteria you want to focus on in comparing the items. Along the left side of the page, list each of the criteria. Across the top, list the names of the items. You should then have a box per item for each criterion; you can fill the boxes in and then survey what you’ve discovered.

Here’s an example, this time using three pizza places:

As you generate points of comparison, consider the purpose and content of the assignment and the focus of the class. What do you think the professor wants you to learn by doing this comparison/contrast? How does it fit with what you have been studying so far and with the other assignments in the course? Are there any clues about what to focus on in the assignment itself?

Here are some general questions about different types of things you might have to compare. These are by no means complete or definitive lists; they’re just here to give you some ideas—you can generate your own questions for these and other types of comparison. You may want to begin by using the questions reporters traditionally ask: Who? What? Where? When? Why? How? If you’re talking about objects, you might also consider general properties like size, shape, color, sound, weight, taste, texture, smell, number, duration, and location.

Two historical periods or events

• When did they occur—do you know the date(s) and duration? What happened or changed during each? Why are they significant?
• What kinds of work did people do? What kinds of relationships did they have? What did they value?
• What kinds of governments were there? Who were important people involved?
• What caused events in these periods, and what consequences did they have later on?

Two ideas or theories

• What are they about?
• Did they originate at some particular time?
• Who created them? Who uses or defends them?
• What is the central focus, claim, or goal of each? What conclusions do they offer?
• How are they applied to situations/people/things/etc.?
• Which seems more plausible to you, and why? How broad is their scope?
• What kind of evidence is usually offered for them?

Two pieces of writing or art

• What are their titles? What do they describe or depict?
• What is their tone or mood? What is their form?
• Who created them? When were they created? Why do you think they were created as they were? What themes do they address?
• Do you think one is of higher quality or greater merit than the other(s)—and if so, why?
• For writing: what plot, characterization, setting, theme, tone, and type of narration are used?
• Where are they from? How old are they? What is the gender, race, class, etc. of each?
• What, if anything, are they known for? Do they have any relationship to each other?
• What are they like? What did/do they do? What do they believe? Why are they interesting?
• What stands out most about each of them?

Deciding what to focus on

By now you have probably generated a huge list of similarities and differences—congratulations! Next you must decide which of them are interesting, important, and relevant enough to be included in your paper. Ask yourself these questions:

• What’s relevant to the assignment?
• What’s relevant to the course?
• What’s interesting and informative?
• What matters to the argument you are going to make?
• What’s basic or central (and needs to be mentioned even if obvious)?
• Overall, what’s more important—the similarities or the differences?

Suppose that you are writing a paper comparing two novels. For most literature classes, the fact that they both use Caslon type (a kind of typeface, like the fonts you may use in your writing) is not going to be relevant, nor is the fact that one of them has a few illustrations and the other has none; literature classes are more likely to focus on subjects like characterization, plot, setting, the writer’s style and intentions, language, central themes, and so forth. However, if you were writing a paper for a class on typesetting or on how illustrations are used to enhance novels, the typeface and presence or absence of illustrations might be absolutely critical to include in your final paper.

Sometimes a particular point of comparison or contrast might be relevant but not terribly revealing or interesting. For example, if you are writing a paper about Wordsworth’s “Tintern Abbey” and Coleridge’s “Frost at Midnight,” pointing out that they both have nature as a central theme is relevant (comparisons of poetry often talk about themes) but not terribly interesting; your class has probably already had many discussions about the Romantic poets’ fondness for nature. Talking about the different ways nature is depicted or the different aspects of nature that are emphasized might be more interesting and show a more sophisticated understanding of the poems.

Your thesis

The thesis of your comparison/contrast paper is very important: it can help you create a focused argument and give your reader a road map so they don’t get lost in the sea of points you are about to make. As in any paper, you will want to replace vague reports of your general topic (for example, “This paper will compare and contrast two pizza places,” or “Pepper’s and Amante are similar in some ways and different in others,” or “Pepper’s and Amante are similar in many ways, but they have one major difference”) with something more detailed and specific. For example, you might say, “Pepper’s and Amante have similar prices and ingredients, but their atmospheres and willingness to deliver set them apart.”

Be careful, though—although this thesis is fairly specific and does propose a simple argument (that atmosphere and delivery make the two pizza places different), your instructor will often be looking for a bit more analysis. In this case, the obvious question is “So what? Why should anyone care that Pepper’s and Amante are different in this way?” One might also wonder why the writer chose those two particular pizza places to compare—why not Papa John’s, Dominos, or Pizza Hut? Again, thinking about the context the class provides may help you answer such questions and make a stronger argument. Here’s a revision of the thesis mentioned earlier:

Pepper’s and Amante both offer a greater variety of ingredients than other Chapel Hill/Carrboro pizza places (and than any of the national chains), but the funky, lively atmosphere at Pepper’s makes it a better place to give visiting friends and family a taste of local culture.

You may find our handout on constructing thesis statements useful at this stage.

Organizing your paper

There are many different ways to organize a comparison/contrast essay. Here are two:

Subject-by-subject

Begin by saying everything you have to say about the first subject you are discussing, then move on and make all the points you want to make about the second subject (and after that, the third, and so on, if you’re comparing/contrasting more than two things). If the paper is short, you might be able to fit all of your points about each item into a single paragraph, but it’s more likely that you’d have several paragraphs per item. Using our pizza place comparison/contrast as an example, after the introduction, you might have a paragraph about the ingredients available at Pepper’s, a paragraph about its location, and a paragraph about its ambience. Then you’d have three similar paragraphs about Amante, followed by your conclusion.

The danger of this subject-by-subject organization is that your paper will simply be a list of points: a certain number of points (in my example, three) about one subject, then a certain number of points about another. This is usually not what college instructors are looking for in a paper—generally they want you to compare or contrast two or more things very directly, rather than just listing the traits the things have and leaving it up to the reader to reflect on how those traits are similar or different and why those similarities or differences matter. Thus, if you use the subject-by-subject form, you will probably want to have a very strong, analytical thesis and at least one body paragraph that ties all of your different points together.

A subject-by-subject structure can be a logical choice if you are writing what is sometimes called a “lens” comparison, in which you use one subject or item (which isn’t really your main topic) to better understand another item (which is). For example, you might be asked to compare a poem you’ve already covered thoroughly in class with one you are reading on your own. It might make sense to give a brief summary of your main ideas about the first poem (this would be your first subject, the “lens”), and then spend most of your paper discussing how those points are similar to or different from your ideas about the second.

Point-by-point

Rather than addressing things one subject at a time, you may wish to talk about one point of comparison at a time. There are two main ways this might play out, depending on how much you have to say about each of the things you are comparing. If you have just a little, you might, in a single paragraph, discuss how a certain point of comparison/contrast relates to all the items you are discussing. For example, I might describe, in one paragraph, what the prices are like at both Pepper’s and Amante; in the next paragraph, I might compare the ingredients available; in a third, I might contrast the atmospheres of the two restaurants.

If I had a bit more to say about the items I was comparing/contrasting, I might devote a whole paragraph to how each point relates to each item. For example, I might have a whole paragraph about the clientele at Pepper’s, followed by a whole paragraph about the clientele at Amante; then I would move on and do two more paragraphs discussing my next point of comparison/contrast—like the ingredients available at each restaurant.

There are no hard and fast rules about organizing a comparison/contrast paper, of course. Just be sure that your reader can easily tell what’s going on! Be aware, too, of the placement of your different points. If you are writing a comparison/contrast in service of an argument, keep in mind that the last point you make is the one you are leaving your reader with. For example, if I am trying to argue that Amante is better than Pepper’s, I should end with a contrast that leaves Amante sounding good, rather than with a point of comparison that I have to admit makes Pepper’s look better. If you’ve decided that the differences between the items you’re comparing/contrasting are most important, you’ll want to end with the differences—and vice versa, if the similarities seem most important to you.

Our handout on organization can help you write good topic sentences and transitions and make sure that you have a good overall structure in place for your paper.

Cue words and other tips

To help your reader keep track of where you are in the comparison/contrast, you’ll want to be sure that your transitions and topic sentences are especially strong. Your thesis should already have given the reader an idea of the points you’ll be making and the organization you’ll be using, but you can help them out with some extra cues. The following words may be helpful to you in signaling your intentions:

• like, similar to, also, unlike, similarly, in the same way, likewise, again, compared to, in contrast, in like manner, contrasted with, on the contrary, however, although, yet, even though, still, but, nevertheless, conversely, at the same time, regardless, despite, while, on the one hand … on the other hand.

For example, you might have a topic sentence like one of these:

• Compared to Pepper’s, Amante is quiet.
• Like Amante, Pepper’s offers fresh garlic as a topping.
• Despite their different locations (downtown Chapel Hill and downtown Carrboro), Pepper’s and Amante are both fairly easy to get to.

You may reproduce it for non-commercial use if you use the entire handout and attribute the source: The Writing Center, University of North Carolina at Chapel Hill

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Comparative Essay

Pdf download, what is a comparative essay .

A comparative essay usually requires you to complete these three tasks: 

• Compare and contrast at least two items. 
• Why does the comparison matter? 
• What does the comparison suggest about the items? 
• Sometimes your assignment guidelines will provide a basis for a comparison that sets the criteria. 

Even though your professor may call it a “comparison”, it is usually expected that you will discuss both the similarities and the differences between the items. 

How to Write a Comparative Essay 

1. pick a basis for your comparison.

You need a specific basis for your comparison. Without one, there will be too much information to research. 

Your assignment guidelines may already include a scope of focus for you to write about. If not, your basis should be an idea, category, or theme that applies to each of the items you are comparing. To get started, you may need to complete some preliminary research about your topics or speak with your professor to understand the assignment expectations.

2. Identify the Similarities and Differences. 

Gather information about the items that you will be comparing. You’ll need to identify the similarities and differences for each of the items. 

Remember, your end goal is NOT to list out the similarities and differences between the items. You need to move beyond basic identification to explaining the significance of the similarities and differences. 

Writing Tip: Use a graphic organizer to collect the similarities and differences. 

Try using a Venn diagram or a chart to organize your ideas. 

3. Develop a Thesis Statement

Create a thesis statement based on the results of your comparison. Remember, your thesis needs to be arguable and appropriate for your course. 

Create an arguable thesis 

Go beyond the identification of similarities and differences by explaining their significance. Explain why this comparison matters. Your thesis will become arguable once you add in this portion. 

For instance, you might have compared two islands with similar goat overpopulation for a science course. It’s useful to set the context of these islands and the interventions that people used to deal with the goat overpopulation, but your thesis is not arguable if you only state facts. Adjust your thesis to explain why the similarities and differences matter. For instance, you might explain how the differences in the intervention impacted the ecosystem and the island populations. Depending on your assignment guidelines, you could make suggestions about a future intervention that could be effective in handling goat overpopulation on islands. 

Try these strategies for creating an arguable thesis: 

• Cause and Effect : Identify how the differences and similarities lead to an outcome. For instance, you might discuss how the two different endings in Great Expectations affect how readers understand Pip’s relationship with Estella.  
• Degree of Similarity or Difference : Are there more similarities or more differences between the items you’re comparing? You can create a thesis based on the degree of similarity or difference, but it can become descriptive if you don’t explain why the comparison matters. For example, you could write about the characteristics of Harry Potter and Lord Voldemort from the Harry Potter series. Both characters have similar challenges in their early lives, but the paths they choose lead to different outcomes. 

4. Structure your essay 

There are two basic structures that are typically used for comparative essays. 

Point-by-point method 

The point-by-point method alternates between the items. In this style, you pick a common point of comparison and describe the first item and then the second item. Here is an example of a point-by-point method essay outline.

Introduction 

Introductory material: Describe the wizarding world of Harry Potter and the key characters in the comparison. 

Thesis: Although Ron Weasley and Draco Malfoy are both pure-blood wizards, their interactions with other magical creatures reveal the different values in their socialization. 

Body 1: Discrimination towards House Elves 

• Ron’s opinion of House Elves and their role in the wizarding world 
• Draco’s opinion of House Elves and their role in the wizarding world 
• Comment upon the origin in the differences in opinion and how the opinions changed through socialization 

Body 2: Discrimination towards Giants 

• Ron’s perception of Hagrid 
• Draco’s perception of Hagrid 

Conclusion 

• Summary 
• Explain why this comparison between Ron and Draco matters 

Block Method 

The block method identifies themes to compare and describes all your items together. Here is an example of an essay method outline.

Introductory material : Describe the wizarding world of Harry Potter and the key characters in the comparison. 

Thesis : Although Ron Weasley and Draco Malfoy are both pure-blood wizards, their interactions with other magical creatures reveal the different values in their socialization. 

Block A: Ron Weasley – Discrimination towards magical creatures 

• Ron’s social context and how he learns about the magical hierarchy 
• How Ron discriminates against other magical creatures 

Block B: Draco Malfoy – Discrimination towards magical creatures 

• Draco’s social context and how he learns about the magical hierarchy  
• How Draco discriminates against other magical creatures 
• Analysis – significance of the similarities and differences between Ron and Draco 
• Why this comparison matters 

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Comparative Essays

Writing a comparison usually requires that you assess the similarities and differences between two or more theories, procedures, or processes. You explain to your reader what insights can be gained from the comparison, or judge whether one thing is better than another according to established criteria.

How to Write a Comparative Essay

1. Establish a basis of comparison 

A basis of comparison represents the main idea, category, or theme you will investigate. You will have to do some preliminary reading, likely using your course materials, to get an idea of what kind of criteria you will use to assess whatever you are comparing. A basis of comparison must apply to all items you are comparing, but the details will be different. 

For example, if you are asked to “compare neoclassical architecture and gothic architecture,” you could compare the influence of social context on the two styles.  

2. Gather the details of whatever you are comparing 

Once you have decided what theme or idea you are investigating, you will need to gather details of whatever you are comparing, especially in terms of similarities and differences. Doing so allows you to see which criteria you should use in your comparison, if not specified by your professor or instructor. 

• Appeal to Greek perfection
• Formulaic and mathematical
• Appeal to emotion
• Towers and spires
• Wild and rustic
• Civic buildings

Based on this information, you could focus on how ornamentation and design principles reveal prevailing intellectual thought about architecture in the respective eras and societies.

3. Develop a thesis statement 

After brainstorming, try to develop a thesis statement that identifies the results of your comparison. Here is an example of a fairly common thesis statement structure: 

e.g., Although neoclassical architecture and gothic architecture have [similar characteristics A and B], they reveal profound differences in their interpretation of [C, D, and E]. 

4. Organize your comparison  

You have a choice of two basic methods for organizing a comparative essay: the point-by-point method or the block method.  

The point-by-point method examines one aspect of comparison in each paragraph and usually alternates back and forth between the two objects, texts, or ideas being compared. This method allows you to emphasize points of similarity and of difference as you proceed. 

In the block method, however, you say everything you need to say about one thing, then do the same thing with the other. This method works best if you want readers to understand and agree with the advantages of something you are proposing, such as introducing a new process or theory by showing how it compares to something more traditional.

Sample Outlines for Comparative Essays on Neoclassical and Gothic Architecture 

Building a point-by-point essay.

Using the point-by-point method in a comparative essay allows you to draw direct comparisons and produce a more tightly integrated essay.

1. Introduction

• Introductory material
• Thesis: Although neoclassical and gothic architecture are both western European forms that are exemplified in civic buildings and churches, they nonetheless reveal through different structural design and ornamentation, the different intellectual principles of the two societies that created them.

2. Body Sections/Paragraphs

• Ornamentation in Text 1
• Ornamentation in Text 2
• Major appeal in Text 1
• Major appeal in Text 2
• Style in Text 1
• Style in Text 2

3. Conclusion

• Why this comparison is important?
• What does this comparison tell readers?

Building a Block Method Essay

Using the block method in a comparative essay can help ensure that the ideas in the second block build upon or extend ideas presented in the first block. It works well if you have three or more major areas of comparison instead of two (for example, if you added in a third or fourth style of architecture, the block method would be easier to organize).

• Thesis: The neoclassical style of architecture was a conscious rejection of the gothic style that had dominated in France at the end of the middle ages; it represented a desire to return to the classical ideals of Greece and Rome.
• History and development
• Change from earlier form
• Social context of new form
• What does the comparison reveal about architectural development?
• Why is this comparison important?

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Writing a Paper: Comparing & Contrasting

A compare and contrast paper discusses the similarities and differences between two or more topics. The paper should contain an introduction with a thesis statement, a body where the comparisons and contrasts are discussed, and a conclusion.

Address Both Similarities and Differences

Because this is a compare and contrast paper, both the similarities and differences should be discussed. This will require analysis on your part, as some topics will appear to be quite similar, and you will have to work to find the differing elements.

Make Sure You Have a Clear Thesis Statement

Just like any other essay, a compare and contrast essay needs a thesis statement. The thesis statement should not only tell your reader what you will do, but it should also address the purpose and importance of comparing and contrasting the material.

Use Clear Transitions

Transitions are important in compare and contrast essays, where you will be moving frequently between different topics or perspectives.

• Examples of transitions and phrases for comparisons: as well, similar to, consistent with, likewise, too
• Examples of transitions and phrases for contrasts: on the other hand, however, although, differs, conversely, rather than.

For more information, check out our transitions page.

Structure Your Paper

Consider how you will present the information. You could present all of the similarities first and then present all of the differences. Or you could go point by point and show the similarity and difference of one point, then the similarity and difference for another point, and so on.

Include Analysis

It is tempting to just provide summary for this type of paper, but analysis will show the importance of the comparisons and contrasts. For instance, if you are comparing two articles on the topic of the nursing shortage, help us understand what this will achieve. Did you find consensus between the articles that will support a certain action step for people in the field? Did you find discrepancies between the two that point to the need for further investigation?

Make Analogous Comparisons

When drawing comparisons or making contrasts, be sure you are dealing with similar aspects of each item. To use an old cliché, are you comparing apples to apples?

• Example of poor comparisons: Kubista studied the effects of a later start time on high school students, but Cook used a mixed methods approach. (This example does not compare similar items. It is not a clear contrast because the sentence does not discuss the same element of the articles. It is like comparing apples to oranges.)
• Example of analogous comparisons: Cook used a mixed methods approach, whereas Kubista used only quantitative methods. (Here, methods are clearly being compared, allowing the reader to understand the distinction.

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Writing Resources

Comparative essays.

This handout is available for download in DOCX format and PDF format .

What is a comparative essay?

A comparative essay asks that you compare at least two (or possibly more) items. These items will differ depending on the assignment. You might be asked to compare

• positions on an issue (e.g., responses to midwifery in Canada and the United States)
• theories (e.g., capitalism and communism)
• figures (e.g., GDP in the United States and Britain)
• texts (e.g., Shakespeare’s Hamlet and Macbeth )
• events (e.g., the Great Depression and the global financial crisis of 2008-9)

Although the assignment may say “compare,” the assumption is that you will consider both the similarities and differences; in other words, you will compare and contrast.

Make sure you know the basis for comparison

The assignment sheet may say exactly what you need to compare, or it may ask you to come up with a basis for comparison yourself.

• Provided by the essay question: The essay question may ask that you consider the figure of the gentleman in Charles Dickens’s Great Expectations and Anne Brontë’s The Tenant of Wildfell Hall . The basis for comparison will be the figure of the gentleman.
• Developed by you: The question may simply ask that you compare the two novels. If so, you will need to develop a basis for comparison, that is, a theme, concern, or device common to both works from which you can draw similarities and differences.

Develop a list of similarities and differences

Once you know your basis for comparison, think critically about the similarities and differences between the items you are comparing, and compile a list of them. For example, you might decide that in Great Expectations , being a true gentleman is not a matter of manners or position but morality, whereas in The Tenant of Wildfell Hall , being a true gentleman is not about luxury and self-indulgence but hard work and productivity. Your list is not yet your outline for the essay, but it should provide you with enough similarities and differences to construct an initial plan.

Develop a thesis based on the relative weight of similarities and differences

Once you have listed similarities and differences, decide whether the similarities on the whole outweigh the differences or vice versa. Create a thesis statement that reflects their relative weights. A more complex thesis will usually include both similarities and differences and will argue that one of them (either the similarities or the differences) outweighs the other.

Come up with a structure for your essay

Alternating method: point-by-point pattern.

In the alternating method, you find points common to your central subjects A and B, and alternate between A and B on the basis of these points (ABABAB …). For instance, a comparative essay on the French and Russian revolutions might examine how both revolutions either encouraged or thwarted innovation in terms of new technology (body paragraphs 1 and 2), military strategy (body paragraphs 3 and 4), and the administrative system (body paragraphs 5 and 6).

Two notes about the alternating method:

• The two entities may be dissimilar in the themes you identify. To use this method, they need not be similar; you just need to have something to say about both A and B in each area.
• You may certainly include more than three pairs of alternating points: allow the subject matter to determine the number of points you develop in the body of your essay.

When do I use the alternating method?

The alternating method generally does a better job of highlighting similarities and differences between A and B. It also tends to produce a more tightly integrated and analytical paper. Consider the alternating method if you are able to identify clearly related points between A and B. Otherwise, if you attempt to impose the alternating method, you will probably find it counterproductive.

Block method: Subject-by-subject pattern

In the block method (AB), you discuss all of A, then all of B. For example, a comparative essay using the block method on the French and Russian revolutions would address the French Revolution in the first half of the essay and the Russian Revolution in the second half. If you choose the block method, however, make sure they are connected! The B block should refer to the A block and make clear points of comparison whenever comparisons are relevant: (“Unlike A, B . . .” or “Like A, B . . .”). This technique will allow for a higher level of critical engagement, continuity, and cohesion.

When do I use the block method?

The block method is particularly useful in the following cases:

• You are unable to find points about A and B that are closely related to each other.
• Your ideas about B build upon or extend your ideas about A.
• You are comparing three or more subjects as opposed to the traditional two.

Adapted from the University of Toronto, https://advice.writing.utoronto.ca/types-of-writing/comparative-essay/, 2020.

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Full Guide For College Students On How To Write A Comparative Essay

As you advance throughout your academic career, you’ll be asked to finish several types of academic writing. Writing for academic purposes isn’t difficult, but students should follow certain rules to make sure that they’re completing an adequate essay or paper. A comparative essay isn’t a challenging type of writing, and most students can finish theirs in excellent quality when they know how to write a comparative essay adequately. Understanding how to write a comparative essay properly means that you won’t waste time or effort. Moreover, your assignment will impress professors and make them impressed by the amount of work you’ve put into it.

What Is A Comparative Essay?

A comparison essay is where students are asked to compare two or more ideas or items. The range of difficulty varies as you advance throughout your academic journey. Starting from lower grades, teachers might ask you to compare two sports to teach you how to write a comparative essay, but later on, in college, things get more complicated. In college comparative writing, students might be asked to compare two stands or positions concerning a popular topic or several theories related to topics you’re studying.

In comparison essay format, you’re supposed to list similarities and differences between the two items you’re studying. This means that your job is to compare and contrast so you can draw a relationship between topics you’ve studied. For this purpose, your job would be going through several academic approved sources to search for relevant information. You can also check trustworthy websites to find relevant data on  how to format essay  so you can finish your assignment in excellent quality. Practicing this type of writing guarantees that you’ll get grades that qualify you for advancing along your academic path.

Methods Comparative Writing

There are several approaches that experts follow when they’re tackling various comparative essay topics. Understanding both methods help students understand how to write a comparative essay and submit excellent tasks.

Point by point method

Some experts also call this the alternating or slice method while writing a comparative essay. Researchers simply compare two or more items or concepts one point at a time. This means that you should look for similarities that combine both topics and see how they’re tackled differently. It’s rather simple because you can easily highlight points and can craft a good essay that readers find informative.

Advantages:

• This method is specific and detailed.
• Topic sentences in each paragraph focuses on the topic discussed rather than the item you’re comparing.
• Professors think that it’s the best approach towards writing an analytical comparative paper.

Disadvantages:

• This method doesn’t work when your job involves comparing concepts or ideas.
• Paying too much attention to details can tempt students to conclude incorrect similarities between the topics studied.

Block method

In this comparative essay outline, you’ll list all similarities in one paragraph followed by another one where you discuss all the differences.

• Paragraphs are more organized as the topic is discussed as a whole.
• Only the important points are discussed.
• Works if you’re discussing two topics that aren’t closely related.
• There’s no focus on details.

How to Start a Comparative Essay?

Before you start writing your assignment, you should understand a few basic things. This will guarantee that none of your efforts will go in vain.

Identify the core topic

You can identify the main topic by examining the essay question. It should have a clear objective so that students don’t waste their time talking about irrelevant points.

Prepare the content

Once you’ve settled on a topic, it’s time to examine several sources. You should use academically approved sources to gather relevant data for your assignment. Use a mind map and write down notes that help you draw relationships between several points. Make sure that you have all the needed data before moving onto the comparative essay structure.

Make a comparative essay thesis

The thesis is where the writer tells readers what they’re going to read about. The thesis statement brings focus and purpose to your essay, so your audience doesn’t get confused and feel tempted enough to start reading the rest of your assignment.

A complex thesis is where you use words wisely to do a few jobs:

• Introduce the essay topic.
• Explain your topic and position regarding the essay subject.
• State similarities and differences.
• Discuss the structure of the essay, highlighting the main points that should be examined.

There will be two different approaches to writing your thesis statement, depending on whether the similarities outweigh differences or differences outweigh similarities. With regard to the nature of your assignment, it’s your job to make sure that readers understand both and are also able to conclude your stand concerning the main idea.

Comparative Essay Outline

Now that you’ve decided on the approach, you should start working on your comparative essay structure. An essay will naturally have an introduction, body, and conclusion.

Introduction

This part should be simple and clear as readers should easily understand what the essay is about. You should discuss the thesis statement and highlight the purpose of your assignment.

Body Paragraphs

This is where you start listing differences and similarities according to the method you picked. Every topic sentence should focus on a single point, followed by a relevant piece of evidence. Choose words wisely so that readers won’t get confused while reading your essay.

It’s an overview of the topics examined in the body paragraphs. After identifying similarities and differences, you should write a short summary that helps sum up the whole idea.

Comparative Essay Topics

Students need to make sure that they have  good titles for compare and contrast essays , so they don’t end up working on a challenging assignment. Use these ideas if you’re wondering how to write a comparative essay.

• Comparing Gandhi and Stalin.
• Islam vs. Christianity.
• Coke versus Pepsi.
• Overworking: What’s the bad and the good?
• SAT and TOEFL: Stating similarities and differences.
• How did the American and Soviet governments evolve?
• What are the differences and similarities in events that lead to World War 1 and World War 2?
• The economic situation in peace vs war.
• Working as a freelancer or in office. What are the pros and cons?
• Comparing academic and scientific writing.
• Online and traditional education.
• What is the relationship between the Roman and Greek cultures?
• Playing games on laptops and smartphones. Are they like each other?
• Traditional and online marketing methods. How are they different?
• Jazz music vs. Rock music.
• Studying physics and chemistry.
• Various philosophies concerning life and death.
• Public and private schooling.
• Picasso and Dali: Different approaches.
• The progress and evolution of Roman and Egyptian empire.

Comparative Essay Template

Here is a template to follow while working on your compare and contrast essay.

Introduction:

• State the main topic and purpose of your paper.
• Provide all exclusions from previous researches and general findings.
• Highlight your thesis statement or question.
• Follow either the block or alternating methods to address similarities and differences.
• Make sure that each topic statement is followed by a relevant piece of evidence.

Conclusion:

• Summarize topic sentences and provide an answer to thesis question.
• Provide a quick overview of the essay purpose.

Understanding the main parts of a compare and contrast essay guarantees the efficient use of time and effort spent to craft an assignment. Improving your quality of writing means takes time and practice. This is why you should always try to work harder, highlighting your mistakes, and avoiding them in the future.

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Writing effective comparison/contrast essays.

1. Brainstorming and Prewriting

Recall that a comparison/contrast essay serves the purpose of examining the similarities and/or differences between two subjects. When you compare things, you show their similarities; when you contrast things, you show their differences.

The first step in writing a comparison/contrast essay is to brainstorm ideas and decide upon a topic. It's important that you find two things that have enough similarities or differences in order to be able to effectively compare or contrast them. If you choose two things that are too similar, you’ll struggle to find meaningful differences. If you choose two things that are too different, you’ll struggle to find meaningful comparisons.

During the brainstorming stage of the writing process, you can use a variety of activities to help you generate ideas for your topic. It can be helpful to make a list of similarities and differences between your two subjects, then choose the ones that are most important to use in your comparison/contrast essay.

This will help you to see the multitude of similarities and differences, and then focus in on the most important ones to use in your essay:

Clustering, or mapping, is another way to generate ideas using words, shapes, and lines that show the connections between those ideas.

• There are unending things that you can compare/contrast, and choosing two might seem overwhelming. Some common themes for a comparison/contrast essay may include events (Battle of Fort Sumter versus Battle of Sewell’s Point), situations (riding the bus versus driving to work), people (a CEO versus a CFO of a company), and places (London versus Tokyo).
• A good approach for beginner writers can be to pick two things that are in the same overarching category (foods, animals, locations, people, events, etc.) but differ in some significant ways. This can make it easier to see the similarities as well as the differences.
• Don’t forget to consider the "So what?" question when deciding on your topic. Why are you choosing this topic? Why should anyone care? Is it at all meaningful? You should be able to explain to your readers why it is useful that they understand the similarities or differences between these two topics.
• Ghandi and Martin Luther King Jr. (historical figures)
• The 1960s and today (two eras in time)
• Pop music and country music (genres of music)
• Oprah Winfrey and Ellen DeGeneres (talk show hosts)
• Online college courses and in-person college courses (ways to take college courses)
• Communism and socialism (belief systems)
• Solar power and wind energy (energy types)

As you narrow your focus, you will need to determine which points of comparison or contrast are most important. The number of points of comparison or contrast that you settle on will be driven by the topic you choose. However, for the comparison/contrast essay you’ll be writing for this course, you will need to focus in on two or three main points of comparison or contrast.

As you know, an outline can be a useful tool during prewriting to help you further develop the ideas and organization of your essay. Creating an outline will help you plan the way in which you want to organize your body paragraphs, and which details you want to include in each. This will help you to produce a sort of roadmap for your essay.

2. Drafting a Thesis Statement

A good thesis statement is the cornerstone of any academic essay. During the brainstorming and prewriting steps, you will have selected a topic and chosen your strongest main points to either compare or contrast within your essay. This will help you further develop your thesis statement.

A good thesis statement should convey the main points of your essay and should avoid being overly generic.

Instead, a good thesis statement should provide more information on which points of comparison or contrast will be discussed in the essay. Below are some templates you can consider as you begin to draft your thesis statement. A good thesis statement is not required to follow one of these patterns, but as a beginning writer, you may find that they provide a helpful starting point.

For an essay contrasting two subjects, your thesis statement may look something like this:

{Subject 1} and {Subject 2} may appear similar, but they differ in {first point of contrast}, {second point of contrast}, and {third point of contrast}.

Or, if you are comparing two subjects, your thesis statement might look something like this:

{Subject 1} and {Subject 2} do not appear to have a lot in common, but they are very similar in {first point of comparison}, {second point of comparison}, and {third point of comparison}.

A thesis statement might meaningfully contrast two subjects using the template above, like this:

Paris and Tokyo are both large metropolitan cities, but they differ in terms of their job opportunities, average income, and living expenses.

Notice how the primary emphasis in the above thesis is about how the two cities differ based on the three points the author chose to focus on: job opportunities, income, and living expenses. This thesis statement gives the reader a clear idea of the specific points of contrast that will be covered within the body of the essay.

3. Methods of Organization

Now that you have your working thesis statement, you’re ready to begin thinking about how to organize the body paragraphs within your essay.

• The point-by-point method
• The block method

You may also consider your particular approach to the subjects as well as the nature of the subjects themselves; some subjects might better lend themselves to one structure or the other.

3a. Point-by-Point Method

The point-by-point method, also known as the alternating format method, is one method of paragraph development and organization for a comparison/contrast essay.

When you use the point-by-point method, you are choosing one point of comparison and then writing one paragraph about each of your subjects that shows how they are similar or different.

IN CONTEXT If you are comparing two fast-food restaurants, McDonalds and Burger King, you would first determine your points of comparison. Let’s say you're going to focus on similarities in costs, menus, and taste. Your first body paragraph would consider the costs at McDonalds, and your second body paragraph would consider the costs at Burger King. Your third and fourth body paragraphs would consider the menus at McDonalds and Burger King, and your final two body paragraphs would consider the taste of the food at both restaurants.

This method of organizing is usually easier for the reader to follow, as the main points of the body paragraphs alternate in sequence between subjects.

To demonstrate this method, let’s take the thesis statement, "Paris and Tokyo are both large metropolitan cities, but they differ in terms of their job opportunities, average income, and living expenses." In this case, the author is focusing on the differences between the two cities in regard to three main points.

• Introduction + thesis statement
• Body paragraph 1: Job opportunities in Paris
• Body paragraph 2: Job opportunities in Tokyo
• Body paragraph 3: Average income in Paris
• Body paragraph 4: Average income in Tokyo
• Body paragraph 5: Living expenses in Paris
• Body paragraph 6: Living expenses in Tokyo

3b. Block Method

The block method, also known as the subject-by-subject method, is another method of paragraph development and organization in a comparison/contrast essay.

As the name implies, if you choose the block method, you will consider all of your points of comparison or contrast for one subject in the first two or three body paragraphs of your essay, and then discuss the same main points for the second subject in the remaining body paragraphs.

IN CONTEXT If you're contrasting your local grocery store with the giant superstore outside of town, you would first determine your points for contrast. You might choose to focus on the differences in prices, convenience, and atmosphere. You would begin the body of the essay by devoting one paragraph each to these three points about your local grocery store; then, you would write three paragraphs that show how the superstore is different according to those same points.

hint If you choose this method, pay special attention to transition use to help guide your reader.

To demonstrate this method, let’s again take the thesis statement, "Paris and Tokyo are both large metropolitan cities, but they differ in terms of their job opportunities, average income, and living expenses."

• Body paragraph 2: Average income in Paris
• Body paragraph 3: Living expenses in Paris
• Body paragraph 4: Job opportunities in Tokyo
• Body paragraph 5: Average income in Tokyo

4. Using Transitions

Given that comparison/contrast essays analyze the relationship between two subjects, it is also helpful to have some transitions on hand that will cue the reader to such analysis.

These words and phrases help to highlight the points you are trying to make by signaling the relationships between the subjects in a clear way.

Below are some sample transitional words and phrases that you may use to indicate a comparison or contrast.

summary In this lesson, you learned how to begin putting your comparison/contrast essay together by first starting with brainstorming and prewriting, then moving on to drafting a thesis statement . There are two methods of organization for the body of a comparison/contrast essay that you can choose from: the point-by-point method and the block method . The specific way in which you organize your body paragraphs will be largely determined by your topic and subjects, your audience, and your purpose. Whichever method you choose, using transitions effectively can help readers follow along with your main points. Best of luck in your learning!

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How to Write a Comparative Essay

Last Updated: July 17, 2024 Fact Checked

This article was co-authored by Christopher Taylor, PhD . Christopher Taylor is an Adjunct Assistant Professor of English at Austin Community College in Texas. He received his PhD in English Literature and Medieval Studies from the University of Texas at Austin in 2014. There are 7 references cited in this article, which can be found at the bottom of the page. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 1,687,926 times.

Perhaps you have been assigned a comparative essay in class, or need to write a comprehensive comparative report for work. In order to write a stellar comparative essay, you have to start off by picking two subjects that have enough similarities and differences to be compared in a meaningful way, such as two sports teams or two systems of government. Once you have that, then you have to find at least two or three points of comparison and use research, facts, and well-organized paragraphs to impress and captivate your readers. Writing the comparative essay is an important skill that you will use many times throughout your scholastic career.

Comparative Essay Outline and Example

How to Develop the Essay Content

• Many comparative essay assignments will signal their purpose by using words such as "compare," "contrast," "similarities," and "differences" in the language of the prompt.
• Also see whether there are any limits placed on your topic.

• The assignment will generally ask guiding questions if you are expected to incorporate comparison as part of a larger assignment. For example: "Choose a particular idea or theme, such as love, beauty, death, or time, and consider how two different Renaissance poets approach this idea." This sentence asks you to compare two poets, but it also asks how the poets approach the point of comparison. In other words, you will need to make an evaluative or analytical argument about those approaches.
• If you're unclear on what the essay prompt is asking you to do, talk with your instructor. It's much better to clarify questions up front than discover you've written the entire essay incorrectly.

• The best place to start is to write a list of things that the items you are comparing have in common as well as differences between them. [3] X Research source

• You may want to develop a system such as highlighting different types of similarities in different colors, or use different colours if you are using an electronic device.
• For example, if you are comparing two novels, you may want to highlight similarities in characters in pink, settings in blue, and themes or messages in green.

• The basis for your comparison may be assigned to you. Be sure to check your assignment or prompt.
• A basis for comparison may have to do with a theme, characteristics, or details about two different things. [6] X Research source
• A basis for comparison may also be known as the “grounds” for comparison or a frame of reference.
• Keep in mind that comparing 2 things that are too similar makes it hard to write an effective paper. The goal of a comparison paper is to draw interesting parallels and help the reader realize something interesting about our world. This means your subjects must be different enough to make your argument interesting.

• Research may not be required or appropriate for your particular assignment. If your comparative essay is not meant to include research, you should avoid including it.
• A comparative essay about historical events, social issues, or science-related topics are more likely to require research, while a comparison of two works of literature are less likely to require research.
• Be sure to cite any research data properly according to the discipline in which you are writing (eg, MLA, APA, or Chicago format).

• Your thesis needs to make a claim about your subjects that you will then defend in your essay. It's good for this claim to be a bit controversial or up for interpretation, as this allows you to build a good argument.

How to Organize the Content

• Use a traditional outline form if you would like to, but even a simple list of bulleted points in the order that you plan to present them would help.
• You can also write down your main points on sticky notes (or type them, print them, and then cut them out) so that you can arrange and rearrange them before deciding on a final order.

• The advantages of this structure are that it continually keeps the comparison in the mind of the reader and forces you, the writer, to pay equal attention to each side of the argument.
• This method is especially recommended for lengthy essays or complicated subjects where both the writer and reader can easily become lost. For Example: Paragraph 1: Engine power of vehicle X / Engine power of vehicle Y Paragraph 2: Stylishness of vehicle X / Stylishness of vehicle Y Paragraph 3: Safety rating of vehicle X / Safety rating of vehicle Y

• The advantages of this structure are that it allows you to discuss points in greater detail and makes it less jarring to tackle two topics that radically different.
• This method is especially recommended for essays where some depth and detail are required. For example: Paragraph 1: Engine power of vehicle X Paragraph 2: Engine power of vehicle Y Paragraph 3: Stylishness of vehicle X Paragraph 4: Stylishness of vehicle Y Paragraph 5: Safety rating of vehicle X Paragraph 6: Safety rating of vehicle Y

• This method is by far the most dangerous, as your comparison can become both one-sided and difficult for the reader to follow.
• This method is only recommended for short essays with simplistic subjects that the reader can easily remember as (s)he goes along. For example: Paragraph 1: Engine power of vehicle X Paragraph 2: Stylishness of vehicle X Paragraph 3: Safety rating of vehicle X Paragraph 4: Engine power of vehicle Y Paragraph 5: Stylishness of vehicle Y Paragraph 6: Safety rating of vehicle Y

How to Write the Essay

• Body paragraphs first . Work through all that information you've been compiling and see what kind of story it tells you. Only when you've worked with your data will you know what the larger point of the paper is.
• Conclusion second . Now that you've done all the heavy lifting, the point of your essay should be fresh in your mind. Strike while the iron’s hot. Start your conclusion with a restatement of your thesis.
• Intro last . Open your introduction with a "hook" to grab the reader's attention. Since you've already written your essay, choose a hook that reflects what you will talk about, whether it's a quote, statistic, factoid, rhetorical question, or anecdote. Then, write 1-2 sentences about your topic, narrowing down to your thesis statement, which completes your introduction.

• Organize your paragraphs using one of the approaches listed in the "Organizing the Content" part below. Once you have defined your points of comparison, choose the structure for the body paragraphs (where your comparisons go) that makes the most sense for your data. To work out all the organizational kinks, it’s recommended that you write an outline as a placeholder.
• Be very careful not to address different aspects of each subject. Comparing the color of one thing to the size of another does nothing to help the reader understand how they stack up.

• Be aware that your various comparisons won’t necessarily lend themselves to an obvious conclusion, especially because people value things differently. If necessary, make the parameters of your argument more specific. (Ex. “Though X is more stylish and powerful, Y’s top safety ratings make it a more appropriate family vehicle .”)
• When you have two radically different topics, it sometimes helps to point out one similarity they have before concluding. (i.e. "Although X and Y don't seem to have anything in common, in actuality, they both ....”)

• Even the best writers know editing is important to produce a good piece. Your essay will not be your best effort unless you revise it.
• If possible, find a friend to look over the essay, as he or she may find problems that you missed.
• It sometimes helps to increase or decrease the font size while editing to change the visual layout of the paper. Looking at the same thing for too long makes your brain fill in what it expects instead of what it sees, leaving you more likely to overlook errors.

Expert Q&A

• The title and introduction really catch the reader's attention and make them read the essay. Make sure you know how to write a catchy essay title . Thanks Helpful 6 Not Helpful 1
• Quotes should be used sparingly and must thoroughly complement the point they are being used to exemplify/justify. Thanks Helpful 5 Not Helpful 2
• The key principle to remember in a comparative paragraph or essay is that you must clarify precisely what you are comparing and keep that comparison alive throughout the essay. Thanks Helpful 3 Not Helpful 2

• Avoid vague language such as "people," "stuff," "things," etc. Thanks Helpful 4 Not Helpful 0
• Avoid, at all costs, the conclusion that the two subjects are "similar, yet different." This commonly found conclusion weakens any comparative essay, because it essentially says nothing about the comparison. Most things are "similar, yet different" in some way. Thanks Helpful 4 Not Helpful 0
• Some believe that an "unbalanced" comparison - that is, when the essay focuses predominantly on one of the two issues, and gives less importance to the other - is weaker, and that writers should strive for 50/50 treatment of the texts or issues being examined. Others, however, value emphasis in the essay that reflects the particular demands of the essay's purpose or thesis. One text may simply provide context, or historical/artistic/political reference for the main text, and therefore need not occupy half of the essay's discussion or analysis. A "weak" essay in this context would strive to treat unequal texts equally, rather than strive to appropriately apportion space to the relevant text. Thanks Helpful 3 Not Helpful 0
• Beware of the "Frying Pan Conclusion" in which you simply recount everything that was said in the main body of the essay. While your conclusion should include a simple summary of your argument, it should also emphatically state the point in a new and convincing way, one which the reader will remember clearly. If you can see a way forward from a problem or dilemma, include that as well. Thanks Helpful 2 Not Helpful 1

You Might Also Like

• ↑ http://writingcenter.unc.edu/handouts/comparing-and-contrasting/
• ↑ http://www.writing.utoronto.ca/advice/specific-types-of-writing/comparative-essay
• ↑ https://writingcenter.unc.edu/tips-and-tools/comparing-and-contrasting/
• ↑ https://www.butte.edu/departments/cas/tipsheets/style_purpose_strategy/compare_contrast.html
• ↑ https://open.lib.umn.edu/writingforsuccess/chapter/10-7-comparison-and-contrast/
• ↑ https://owl.purdue.edu/owl/general_writing/the_writing_process/proofreading/steps_for_revising.html
• How to Structure Paragraphs in an Essay

About This Article

To write a comparative essay, start by writing an introduction that introduces the 2 subjects you'll be comparing. You should also include your thesis statement in the introduction, which should state what you've concluded based on your comparisons. Next, write the body of your essay so that each paragraph focuses on one point of comparison between your subjects. Finally, write a conclusion that summarizes your main points and draws a larger conclusion about the two things you compared. To learn how to do research for your essay, read on! Did this summary help you? Yes No

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Comparative Essay

How to Write a Comparative Essay – A Complete Guide

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Comparative essay is a common assignment for school and college students. Many students are not aware of the complexities of crafting a strong comparative essay. 

If you too are struggling with this, don't worry!

In this blog, you will get a complete writing guide for comparative essay writing. From structuring formats to creative topics, this guide has it all.

So, keep reading!

• 1. What is a Comparative Essay?
• 2. Comparative Essay Structure
• 3. How to Start a Comparative Essay?
• 4. How to Write a Comparative Essay?
• 5. Comparative Essay Examples
• 6. Comparative Essay Topics
• 7. Tips for Writing A Good Comparative Essay
• 8. Transition Words For Comparative Essays

What is a Comparative Essay?

A comparative essay is a type of essay in which an essay writer compares at least two or more items. The author compares two subjects with the same relation in terms of similarities and differences depending on the assignment.

The main purpose of the comparative essay is to:

• Highlight the similarities and differences in a systematic manner.
• Provide great clarity of the subject to the readers.
• Analyze two things and describe their advantages and drawbacks.

A comparative essay is also known as compare and contrast essay or a comparison essay. It analyzes two subjects by either comparing them, contrasting them, or both. The Venn diagram is the best tool for writing a paper about the comparison between two subjects.  

Moreover, a comparative analysis essay discusses the similarities and differences of themes, items, events, views, places, concepts, etc. For example, you can compare two different novels (e.g., The Adventures of Huckleberry Finn and The Red Badge of Courage).

However, a comparative essay is not limited to specific topics. It covers almost every topic or subject with some relation.

Comparative Essay Structure

A good comparative essay is based on how well you structure your essay. It helps the reader to understand your essay better. 

The structure is more important than what you write. This is because it is necessary to organize your essay so that the reader can easily go through the comparisons made in an essay.

The following are the two main methods in which you can organize your comparative essay.

Point-by-Point Method 

The point-by-point or alternating method provides a detailed overview of the items that you are comparing. In this method, organize items in terms of similarities and differences.

This method makes the writing phase easy for the writer to handle two completely different essay subjects. It is highly recommended where some depth and detail are required.

Below given is the structure of the point-by-point method. 

Block Method 

The block method is the easiest as compared to the point-by-point method. In this method, you divide the information in terms of parameters. It means that the first paragraph compares the first subject and all their items, then the second one compares the second, and so on.

However, make sure that you write the subject in the same order. This method is best for lengthy essays and complicated subjects.

Here is the structure of the block method. 

Therefore, keep these methods in mind and choose the one according to the chosen subject.

Mixed Paragraphs Method

In this method, one paragraph explains one aspect of the subject. As a writer, you will handle one point at a time and one by one. This method is quite beneficial as it allows you to give equal weightage to each subject and help the readers identify the point of comparison easily.

How to Start a Comparative Essay?

Here, we have gathered some steps that you should follow to start a well-written comparative essay.  

Choose a Topic

The foremost step in writing a comparative essay is to choose a suitable topic.

Choose a topic or theme that is interesting to write about and appeals to the reader. 

An interesting essay topic motivates the reader to know about the subject. Also, try to avoid complicated topics for your comparative essay. 

Develop a List of Similarities and Differences 

Create a list of similarities and differences between two subjects that you want to include in the essay. Moreover, this list helps you decide the basis of your comparison by constructing your initial plan. 

Evaluate the list and establish your argument and thesis statement .

Establish the Basis for Comparison 

The basis for comparison is the ground for you to compare the subjects. In most cases, it is assigned to you, so check your assignment or prompt.

Furthermore, the main goal of the comparison essay is to inform the reader of something interesting. It means that your subject must be unique to make your argument interesting.  

Do the Research 

In this step, you have to gather information for your subject. If your comparative essay is about social issues, historical events, or science-related topics, you must do in-depth research.    

However, make sure that you gather data from credible sources and cite them properly in the essay.

Create an Outline

An essay outline serves as a roadmap for your essay, organizing key elements into a structured format.

With your topic, list of comparisons, basis for comparison, and research in hand, the next step is to create a comprehensive outline. 

Here is a standard comparative essay outline:

How to Write a Comparative Essay?

Now that you have the basic information organized in an outline, you can get started on the writing process. 

Here are the essential parts of a comparative essay: 

Comparative Essay Introduction 

Start off by grabbing your reader's attention in the introduction . Use something catchy, like a quote, question, or interesting fact about your subjects. 

Then, give a quick background so your reader knows what's going on. 

The most important part is your thesis statement, where you state the main argument , the basis for comparison, and why the comparison is significant.

This is what a typical thesis statement for a comparative essay looks like:

Comparative Essay Body Paragraphs 

The body paragraphs are where you really get into the details of your subjects. Each paragraph should focus on one thing you're comparing.

Start by talking about the first point of comparison. Then, go on to the next points. Make sure to talk about two to three differences to give a good picture.

After that, switch gears and talk about the things they have in common. Just like you discussed three differences, try to cover three similarities. 

This way, your essay stays balanced and fair. This approach helps your reader understand both the ways your subjects are different and the ways they are similar. Keep it simple and clear for a strong essay.

Comparative Essay Conclusion

In your conclusion , bring together the key insights from your analysis to create a strong and impactful closing.

Consider the broader context or implications of the subjects' differences and similarities. What do these insights reveal about the broader themes or ideas you're exploring?

Discuss the broader implications of these findings and restate your thesis. Avoid introducing new information and end with a thought-provoking statement that leaves a lasting impression.

Below is the detailed comparative essay template format for you to understand better.

Comparative Essay Format

Comparative Essay Examples

Have a look at these comparative essay examples pdf to get an idea of the perfect essay.

Comparative Essay on Summer and Winter

Comparative Essay on Books vs. Movies

Comparative Essay Sample

Comparative Essay Thesis Example

Comparative Essay on Football vs Cricket

Comparative Essay on Pet and Wild Animals

Comparative Essay Topics

Comparative essay topics are not very difficult or complex. Check this list of essay topics and pick the one that you want to write about.

• How do education and employment compare?
• Living in a big city or staying in a village.
• The school principal or college dean.
• New Year vs. Christmas celebration.
• Dried Fruit vs. Fresh. Which is better?
• Similarities between philosophy and religion.
• British colonization and Spanish colonization.
• Nuclear power for peace or war?
• Bacteria or viruses.
• Fast food vs. homemade food.

Tips for Writing A Good Comparative Essay

Writing a compelling comparative essay requires thoughtful consideration and strategic planning. Here are some valuable tips to enhance the quality of your comparative essay:

• Clearly define what you're comparing, like themes or characters.
• Plan your essay structure using methods like point-by-point or block paragraphs.
• Craft an introduction that introduces subjects and states your purpose.
• Ensure an equal discussion of both similarities and differences.
• Use linking words for seamless transitions between paragraphs.
• Gather credible information for depth and authenticity.
• Use clear and simple language, avoiding unnecessary jargon.
• Dedicate each paragraph to a specific point of comparison.
• Summarize key points, restate the thesis, and emphasize significance.
• Thoroughly check for clarity, coherence, and correct any errors.

Transition Words For Comparative Essays

Transition words are crucial for guiding your reader through the comparative analysis. They help establish connections between ideas and ensure a smooth flow in your essay. 

Here are some transition words and phrases to improve the flow of your comparative essay:

Transition Words for Similarities

• Correspondingly
• In the same vein
• In like manner
• In a similar fashion
• In tandem with

Transition Words for Differences

• On the contrary
• In contrast
• Nevertheless
• In spite of
• Notwithstanding
• On the flip side
• In contradistinction

Check out this blog listing more transition words that you can use to enhance your essay’s coherence!

In conclusion, now that you have the important steps and helpful tips to write a good comparative essay, you can start working on your own essay. 

However, if you find it tough to begin, you can always hire our college paper writing service .

Our skilled writers can handle any type of essay or assignment you need. So, don't wait—place your order now and make your academic journey easier!

Frequently Asked Question

How long is a comparative essay.

A comparative essay is 4-5 pages long, but it depends on your chosen idea and topic.

How do you end a comparative essay?

Here are some tips that will help you to end the comparative essay.

• Restate the thesis statement
• Wrap up the entire essay
• Highlight the main points

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• Writing for Success: Compare/Contrast

LEARNING OBJECTIVES

This section will help you determine the purpose and structure of comparison/contrast in writing.

The Purpose of Compare/Contrast in Writing

Comparison in writing discusses elements that are similar, while contrast in writing discusses elements that are different. A compare-and-contrast essay, then, analyzes two subjects by comparing them, contrasting them, or both.

The key to a good compare-and-contrast essay is to choose two or more subjects that connect in a meaningful way. The purpose of conducting the comparison or contrast is not to state the obvious but rather to illuminate subtle differences or unexpected similarities. For example, if you wanted to focus on contrasting two subjects you would not pick apples and oranges; rather, you might choose to compare and contrast two types of oranges or two types of apples to highlight subtle differences. For example, Red Delicious apples are sweet, while Granny Smiths are tart and acidic. Drawing distinctions between elements in a similar category will increase the audience’s understanding of that category, which is the purpose of the compare-and-contrast essay.

Similarly, to focus on comparison, choose two subjects that seem at first to be unrelated. For a comparison essay, you likely would not choose two apples or two oranges because they share so many of the same properties already. Rather, you might try to compare how apples and oranges are quite similar. The more divergent the two subjects initially seem, the more interesting a comparison essay will be.

The Structure of a Compare/Contrast Essay

The compare-and-contrast essay starts with a thesis that clearly states the two subjects that are to be compared, contrasted, or both and the reason for doing so. The thesis could lean more toward comparing, contrasting, or both. Remember, the point of comparing and contrasting is to provide useful knowledge to the reader. Take the following thesis as an example that leans more toward contrasting:

Thesis Statement: Organic vegetables may cost more than those that are conventionally grown, but when put to the test, they are definitely worth every extra penny.

Here the thesis sets up the two subjects to be compared and contrasted (organic versus conventional vegetables), and it makes a claim about the results that might prove useful to the reader.

You may organize compare-and-contrast essays in one of the following two ways:

• According to the subjects themselves, discussing one then the other
• According to individual points, discussing each subject in relation to each point

The organizational structure you choose depends on the nature of the topic, your purpose, and your audience.

Given that compare-and-contrast essays analyze the relationship between two subjects, it is helpful to have some phrases on hand that will cue the reader to such analysis.

Phrases of Comparison and Contrast

Writing an Compare/Contrast Essay

First choose whether you want to compare seemingly disparate subjects, contrast seemingly similar subjects, or compare and contrast subjects. Once you have decided on a topic, introduce it with an engaging opening paragraph. Your thesis should come at the end of the introduction, and it should establish the subjects you will compare, contrast, or both as well as state what can be learned from doing so.

The body of the essay can be organized in one of two ways: by subject or by individual points. The organizing strategy that you choose will depend on, as always, your audience and your purpose. You may also consider your particular approach to the subjects as well as the nature of the subjects themselves; some subjects might better lend themselves to one structure or the other. Make sure to use comparison and contrast phrases to cue the reader to the ways in which you are analyzing the relationship between the subjects.

After you finish analyzing the subjects, write a conclusion that summarizes the main points of the essay and reinforces your thesis.

Compare/Contrast Essay Example

Comparing and Contrasting London and Washington, DC

By Scott McLean in Writing for Success

Both Washington, DC, and London are capital cities of English-speaking countries, and yet they offer vastly different experiences to their residents and visitors. Comparing and contrasting the two cities based on their history, their culture, and their residents show how different and similar the two are.

Both cities are rich in world and national history, though they developed on very different time lines. London, for example, has a history that dates back over two thousand years. It was part of the Roman Empire and known by the similar name, Londinium. It was not only one of the northernmost points of the Roman Empire but also the epicenter of the British Empire where it held significant global influence from the early sixteenth century on through the early twentieth century. Washington, DC, on the other hand, has only formally existed since the late eighteenth century. Though Native Americans inhabited the land several thousand years earlier, and settlers inhabited the land as early as the sixteenth century, the city did not become the capital of the United States until the 1790s. From that point onward to today, however, Washington, DC, has increasingly maintained significant global influence. Even though both cities have different histories, they have both held, and continue to hold, significant social influence in the economic and cultural global spheres.

Both Washington, DC, and London offer a wide array of museums that harbor many of the world’s most prized treasures. While Washington, DC, has the National Gallery of Art and several other Smithsonian galleries, London’s art scene and galleries have a definite edge in this category. From the Tate Modern to the British National Gallery, London’s art ranks among the world’s best. This difference and advantage has much to do with London and Britain’s historical depth compared to that of the United States. London has a much richer past than Washington, DC, and consequently has a lot more material to pull from when arranging its collections. Both cities have thriving theater districts, but again, London wins this comparison, too, both in quantity and quality of theater choices. With regard to other cultural places like restaurants, pubs, and bars, both cities are very comparable. Both have a wide selection of expensive, elegant restaurants as well as a similar amount of global and national chains. While London may be better known for its pubs and taste in beer, DC offers a different bar-going experience. With clubs and pubs that tend to stay open later than their British counterparts, the DC night life tend to be less reserved overall.

Both cities also share and differ in cultural diversity and cost of living. Both cities share a very expensive cost of living—both in terms of housing and shopping. A downtown one-bedroom apartment in DC can easily cost $1,800 per month, and a similar “flat” in London may double that amount. These high costs create socioeconomic disparity among the residents. Although both cities’ residents are predominantly wealthy, both have a significantly large population of poor and homeless. Perhaps the most significant difference between the resident demographics is the racial makeup. Washington, DC, is a “minority majority” city, which means the majority of its citizens are races other than white. In 2009, according to the US Census, 55 percent of DC residents were classified as “Black or African American” and 35 percent of its residents were classified as “white.” London, by contrast, has very few minorities—in 2006, 70 percent of its population was “white,” while only 10 percent was “black.” The racial demographic differences between the cities is drastic.

Even though Washington, DC, and London are major capital cities of English-speaking countries in the Western world, they have many differences along with their similarities. They have vastly different histories, art cultures, and racial demographics, but they remain similar in their cost of living and socioeconomic disparity.

KEY TAKEAWAYS

• A compare-and-contrast essay analyzes two subjects by either comparing them, contrasting them, or both.
• The purpose of writing a comparison or contrast essay is not to state the obvious but rather to illuminate subtle differences or unexpected similarities between two subjects.
• The thesis should clearly state the subjects that are to be compared, contrasted, or both, and it should state what is to be learned from doing so.
• There are two main organizing strategies for compare-and-contrast essays.
• Organize by the subjects themselves, one then the other.
• Organize by individual points, in which you discuss each subject in relation to each point.
• Use phrases of comparison or phrases of contrast to signal to readers how exactly the two subjects are being analyzed.
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• Successful Writing. Provided by : Anonymous. Located at : http://2012books.lardbucket.org/books/successful-writing/s14-07-comparison-and-contrast.html . License : CC BY-NC-SA: Attribution-NonCommercial-ShareAlike
• Comparing and Contrasting London and Washington, DC. Authored by : Scott McLean. Located at : http://2012books.lardbucket.org/books/successful-writing/s14-07-comparison-and-contrast.html . License : CC BY-NC-SA: Attribution-NonCommercial-ShareAlike
• Table of Contents

Instructor Resources (Access Requires Login)

• Overview of Instructor Resources

An Overview of the Writing Process

• Introduction to the Writing Process
• Introduction to Writing
• Your Role as a Learner
• What is an Essay?
• Reading to Write
• Defining the Writing Process
• Videos: Prewriting Techniques
• Thesis Statements
• Organizing an Essay
• Creating Paragraphs
• Conclusions
• Editing and Proofreading
• Matters of Grammar, Mechanics, and Style
• Peer Review Checklist
• Comparative Chart of Writing Strategies

Using Sources

• Quoting, Paraphrasing, and Avoiding Plagiarism
• Formatting the Works Cited Page (MLA)
• Citing Paraphrases and Summaries (APA)
• APA Citation Style, 6th edition: General Style Guidelines

Definition Essay

• Definitional Argument Essay
• How to Write a Definition Essay
• Critical Thinking
• Video: Thesis Explained
• Effective Thesis Statements
• Student Sample: Definition Essay

Narrative Essay

• Introduction to Narrative Essay
• Student Sample: Narrative Essay
• "Shooting an Elephant" by George Orwell
• "Sixty-nine Cents" by Gary Shteyngart
• Video: The Danger of a Single Story
• How to Write an Annotation
• How to Write a Summary
• Writing for Success: Narration

Illustration/Example Essay

• Introduction to Illustration/Example Essay
• "She's Your Basic L.O.L. in N.A.D" by Perri Klass
• "April & Paris" by David Sedaris
• Writing for Success: Illustration/Example
• Student Sample: Illustration/Example Essay

Compare/Contrast Essay

• Introduction to Compare/Contrast Essay
• "Disability" by Nancy Mairs
• "Friending, Ancient or Otherwise" by Alex Wright
• "A South African Storm" by Allison Howard
• Student Sample: Compare/Contrast Essay

Cause-and-Effect Essay

• Introduction to Cause-and-Effect Essay
• "Cultural Baggage" by Barbara Ehrenreich
• "Women in Science" by K.C. Cole
• Writing for Success: Cause and Effect
• Student Sample: Cause-and-Effect Essay

Argument Essay

• Introduction to Argument Essay
• Rogerian Argument
• "The Case Against Torture," by Alisa Soloman
• "The Case for Torture" by Michael Levin
• How to Write a Summary by Paraphrasing Source Material
• Writing for Success: Argument
• Student Sample: Argument Essay
• Grammar/Mechanics Mini-lessons
• Mini-lesson: Subjects and Verbs, Irregular Verbs, Subject Verb Agreement
• Mini-lesson: Sentence Types
• Mini-lesson: Fragments I
• Mini-lesson: Run-ons and Comma Splices I
• Mini-lesson: Comma Usage
• Mini-lesson: Parallelism
• Mini-lesson: The Apostrophe
• Mini-lesson: Capital Letters
• Grammar Practice - Interactive Quizzes
• De Copia - Demonstration of the Variety of Language
• Style Exercise: Voice

9 Easy Steps for Writing a Compare and Contrast Essay

• Posted on November 17, 2023 November 17, 2023

Compare and contrast essays are common assignments in middle and high school English classes. They frequently show up in college as well, and while this task may not be explicitly given to professionals, the ability to compare two subjects critically during the writing process is crucial to academics of every age.

Once you master this type of essay , you will see benefits throughout your life. Strong comparison skills will help you write better college entrance essays and argue your point in debates. These skills will improve your test scores and deepen your college papers. Looking professionally, they could aid in easily convincing team members of anything from a new workflow software to a functional coffeemaker to a promotion.

In order to write a good compare and contrast essay , though, you need the ability to formulate a highly-researched and well-structured piece of academic writing . That means understanding the type of essay assigned, familiarizing yourself with this specific writing process , and knowing how to effectively incorporate transition words . It also requires a firm grasp of different styles of citations , in order to lend confidence to your argument and give proper credit to others.

Let’s take a look at what exactly a comparison essay is, what purpose its writing serves, and how to write one in nine easy steps.

What is a Compare and Contrast Essay ?

A compare and contrast essay is exactly what it sounds like. You take two – or sometimes more – items and evaluate the similarities and differences between them. Your paper might tackle any subject, such as science, history, economics, literature, or philosophy.

Comparing essays are different from other types of essays that are commonly assigned in school. For instance, a descriptive essay usually pertains to one subject, book, or idea, exploring it in detail. A persuasive essay, on the other hnad, tries to convince the reader to take one specific course of action.

The main aspect of contrast essay topics is that they consider two subjects or ideas at once. Some of the most common contrast essay examples include comparisons between:

• Exploring two different scientific methods for similarities and differences in approach
• Reading contextually two classic novels from the same time period
• Examining contrasting political systems in the United States or abroad
• Looking at two different cultures to see values and practices they share and, conversely, do not share
• Considering two possible approaches to a moral or logistical problem
• Exploring two methods of farming specifically focusing on productivity, simplicity, and empirical evidence

You could theoretically use this organizational structure to examine two items within the same category for almost any subject.

Purpose of a Compare and Contrast Essay

The purpose of a compare and contrast essay is to point out all the similarities and all differences between two nouns, ideas, et cetera. Considering two ideas fully can naturally transition into an ability to argue for or against a position or stance.

In debate, for example, comparing and contrasting is a critical skill as you must be able to examine the topic from both angles. Obviously, you need to make a case for your own side of the debate, however it is critical you see the other side’s point of view as well. Otherwise, you will find yourself completely unprepared for their arguments. Therefore, comparing the benefits, ideological underpinnings and rhetorical styles that best match both sides of an issue is an excellent lifelong skill.

In literature, you will benefit from the ability to compare two books for themes, writing style, word choice, characterization, and more. Doing so helps you become a better writer yourself, as well as understand the complexity of the human condition.

Knowing how to develop a solid argument, moreover, helps you:

• Deepen your critical thinking skills
• Develop eloquence in your speaking and writing
• Practice using skills such as outlining and reading for clues
• Explore how context changes meaning

Now let’s explore exactly how to write one, step by step.

How to Write a Compare and Contrast Essay

You will complete your compare and contrast essay in three main stages: researching, writing and proofreading. While this might sound like an overly formal approach, it is effective because it allows you to organize your main points ahead of time, using any visual aid you might need to see the similarities and differences.

Once you’ve laid out your points of comparison , you can group them according to likeness. There are two methods for this we will discuss: the alternating method and the block method . These will allow you to craft your main thesis and insert appropriate transitions where needed. Then you’ll add an introduction and conclusion to round out the paper before moving on to proofreading.

Make sure you spend enough time on the research phase. It is tempting to skip over this part and launch into the writing, bypassing the less-exciting step of examining your sources thoroughly. However, this is a good way to miss important points that might reinforce or work against your argument.

Step 1: Conduct Initial Research

Your initial research should answer questions such as:

• What sources will I use (if given a choice by my teacher or professor)? Do I need additional sources to support or strengthen the research from my first ones? Do I have enough information to write the paper?
• Do my subjects have enough in common that comparing and contrasting them will be useful? Apples and oranges might be different, but they are at least both types of fruit; apples and cats aren’t a very useful comparison at all.
• Has anyone else compared these two subjects before? Should I take a look at their work to see what to do/not to do?

Step 2: List Out Similarities & Differences

Next, it’s time to list out what is similar and what is different between your two items. Let’s say you are contrasting two books from the 1800s. The Strange Case of Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson and Frankenstein by Mary Shelley are both early examples of science fiction, so they make a good pair.

Start by using a Venn diagram , chart, or another visual tool to make a side by side comparison. You might include setting, plot, characters, year written and year set, mood, themes, tone and appearances throughout later pop culture. Make sure your points of comparison are grouped together so you’re not searching for the corollaries later.

Step 3: Develop a Thesis Statement

Once you have rough compare and contrast sentences written out, you can then craft a topic sentence . This is also known as a thesis or thesis statement , in which you lay out the main argument you will make.

For instance, you might write “While The Strange Case of Dr. Jekyll and Mr. Hyde by Robert Louis Stevenson and Frankenstein by Mary Shelley both use elements of speculative fiction and folklore differently, they speak to the same innate fear that our humanity is a fragile thing.” This shows the reader that you are going to share both the differences (the main writing elements) and similarities (themes) in the paragraphs to come.

Having established the case you will make, it is time to turn those rough points and thesis sentences into a fully fleshed-out paper. Let’s move on to the writing.

Step 4: Create an Outline

Armed with your main points , you should now elevate your rough content into an outline. There are two main ways to structure a compare and contrast essay ; the alternating method and the block method .

• Alternating Method : In this method, you alternate between one item and another, back and forth. So in our example, you would first tackle the setting of both books, comparing and contrasting. Next, are the characters, with similarities and differences as well. Work your way down the list, speaking about both subjects in turn. This will buffer your argument throughout.
• Block Method : With this approach, you instead tackle all aspects of one topic in a block , then the other, subject by subject . That means you would address how Dr. Jekyll and Mr. Hyde uses the setting, characters, time period, and so forth completely. Then you move on to do the same with Frankenstein . In the second block, it makes sense to call out the first book repeatedly, but you will save the main thrust of your argument for the conclusion.

Either approach allows you to create a rough outline of your main points , with additional brainstorming when needed. Afterwards, you can begin with the actual fleshing out of the paper.

Step 5: Write the Introduction

Once you have a thesis statement and an essay outline , the actual essay writing becomes much simpler. Start with the introduction, and plan to have the thesis you created at the end of the intro paragraph(s). Lead up to that statement with a brief description of both items you’re comparing (in this case, the two novels), including pertinent subject matter information such as the author, writing periods, and overarching themes.

Step 6: Write the Body Paragraphs

The most important component of your essay structure is the body paragraphs, and standard essay form asks for three paragraphs. If your essay is longer, instead of using a single paragraph for the first subject , second subject and so on, you might use a whole section. Either way, you will use the first body paragraph as a compare and contrast in the alternating method , or a thorough treatment of the first subject overall. Then, you will address the second subject , and so forth.

Step 7: Write the Conclusion

The conclusion should wrap up your essay overall, driving home the main point of your thesis. Be sure to restate it, not verbatim, but quite closely near the top of your concluding paragraph.

Next, it’s time to make sure you don’t have any outstanding errors or plagiarism that might ruin your grade. Always proofread a paper before turning it in to ensure you are submitting your best work.

Step 8: Check for Spelling & Grammar

First, use a spellchecker to catch errors. Most word processing software offers this tool for spelling and grammar. If you take this approach, make sure it is set correctly to your language and dialect, or mistakes will slip through. Alternatively, you can use an online service, which will help take your writing to the next level.

Step 9: Check for Citation Errors

While most students are honorable and do their own work, it is possible to get caught accidentally plagiarizing simply because you do not know the proper citation rules. For instance, you need to source every quote from a novel, even if you are using the same novel repeatedly and have already cited it in your paper . Sadly, even unintentional plagiarism can lead to serious academic and career consequences, so you must be vigilant.

Luckily, that won’t happen if you use a plagiarism checker like Quetext . Not only does it identify where sources are needed, but it will also help you catch instances of similar wording, which might also require a source citation . Overall, it allows you to:

• Verify your writing for originality so you don’t get caught for plagiarism , even while summarizing or paraphrasing
• Flag content in need of citations
• Add in-text MLA/APA/Chicago-style citations where needed
• Create MLA/APA/Chicago Style citations for references page

Understanding the meaning, purpose and benefits of a compare and contrast essay will enable you to tackle them more effectively from now on. This is especially true if you use the nine steps listed above, which will earn you points in both high school and college courses. That is, if you properly check that you have not plagiarized from any of your sources.

Using a plagiarism checker will benefit you not only in academic settings, but also in all instances of future writing. Even unintentional plagiarism can lead to severe negative consequences regardless of your profession or standing. Plagiarism checkers provide a simple way to ensure you have properly cited and paraphrased all your writing, and give you peace of mind before submitting any work.

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• Comparative Analysis

What It Is and Why It's Useful

Comparative analysis asks writers to make an argument about the relationship between two or more texts. Beyond that, there's a lot of variation, but three overarching kinds of comparative analysis stand out:

• Coordinate (A ↔ B): In this kind of analysis, two (or more) texts are being read against each other in terms of a shared element, e.g., a memoir and a novel, both by Jesmyn Ward; two sets of data for the same experiment; a few op-ed responses to the same event; two YA books written in Chicago in the 2000s; a film adaption of a play; etc. 
• Subordinate (A  → B) or (B → A ): Using a theoretical text (as a "lens") to explain a case study or work of art (e.g., how Anthony Jack's The Privileged Poor can help explain divergent experiences among students at elite four-year private colleges who are coming from similar socio-economic backgrounds) or using a work of art or case study (i.e., as a "test" of) a theory's usefulness or limitations (e.g., using coverage of recent incidents of gun violence or legislation un the U.S. to confirm or question the currency of Carol Anderson's The Second ).
• Hybrid [A  → (B ↔ C)] or [(B ↔ C) → A] , i.e., using coordinate and subordinate analysis together. For example, using Jack to compare or contrast the experiences of students at elite four-year institutions with students at state universities and/or community colleges; or looking at gun culture in other countries and/or other timeframes to contextualize or generalize Anderson's main points about the role of the Second Amendment in U.S. history.

"In the wild," these three kinds of comparative analysis represent increasingly complex—and scholarly—modes of comparison. Students can of course compare two poems in terms of imagery or two data sets in terms of methods, but in each case the analysis will eventually be richer if the students have had a chance to encounter other people's ideas about how imagery or methods work. At that point, we're getting into a hybrid kind of reading (or even into research essays), especially if we start introducing different approaches to imagery or methods that are themselves being compared along with a couple (or few) poems or data sets.

Why It's Useful

In the context of a particular course, each kind of comparative analysis has its place and can be a useful step up from single-source analysis. Intellectually, comparative analysis helps overcome the "n of 1" problem that can face single-source analysis. That is, a writer drawing broad conclusions about the influence of the Iranian New Wave based on one film is relying entirely—and almost certainly too much—on that film to support those findings. In the context of even just one more film, though, the analysis is suddenly more likely to arrive at one of the best features of any comparative approach: both films will be more richly experienced than they would have been in isolation, and the themes or questions in terms of which they're being explored (here the general question of the influence of the Iranian New Wave) will arrive at conclusions that are less at-risk of oversimplification.

For scholars working in comparative fields or through comparative approaches, these features of comparative analysis animate their work. To borrow from a stock example in Western epistemology, our concept of "green" isn't based on a single encounter with something we intuit or are told is "green." Not at all. Our concept of "green" is derived from a complex set of experiences of what others say is green or what's labeled green or what seems to be something that's neither blue nor yellow but kind of both, etc. Comparative analysis essays offer us the chance to engage with that process—even if only enough to help us see where a more in-depth exploration with a higher and/or more diverse "n" might lead—and in that sense, from the standpoint of the subject matter students are exploring through writing as well the complexity of the genre of writing they're using to explore it—comparative analysis forms a bridge of sorts between single-source analysis and research essays.

Typical learning objectives for single-sources essays: formulate analytical questions and an arguable thesis, establish stakes of an argument, summarize sources accurately, choose evidence effectively, analyze evidence effectively, define key terms, organize argument logically, acknowledge and respond to counterargument, cite sources properly, and present ideas in clear prose.

Common types of comparative analysis essays and related types: two works in the same genre, two works from the same period (but in different places or in different cultures), a work adapted into a different genre or medium, two theories treating the same topic; a theory and a case study or other object, etc.

How to Teach It: Framing + Practice

Framing multi-source writing assignments (comparative analysis, research essays, multi-modal projects) is likely to overlap a great deal with "Why It's Useful" (see above), because the range of reasons why we might use these kinds of writing in academic or non-academic settings is itself the reason why they so often appear later in courses. In many courses, they're the best vehicles for exploring the complex questions that arise once we've been introduced to the course's main themes, core content, leading protagonists, and central debates.

For comparative analysis in particular, it's helpful to frame assignment's process and how it will help students successfully navigate the challenges and pitfalls presented by the genre. Ideally, this will mean students have time to identify what each text seems to be doing, take note of apparent points of connection between different texts, and start to imagine how those points of connection (or the absence thereof)

• complicates or upends their own expectations or assumptions about the texts
• complicates or refutes the expectations or assumptions about the texts presented by a scholar
• confirms and/or nuances expectations and assumptions they themselves hold or scholars have presented
• presents entirely unforeseen ways of understanding the texts

—and all with implications for the texts themselves or for the axes along which the comparative analysis took place. If students know that this is where their ideas will be heading, they'll be ready to develop those ideas and engage with the challenges that comparative analysis presents in terms of structure (See "Tips" and "Common Pitfalls" below for more on these elements of framing).

Like single-source analyses, comparative essays have several moving parts, and giving students practice here means adapting the sample sequence laid out at the " Formative Writing Assignments " page. Three areas that have already been mentioned above are worth noting:

• Gathering evidence : Depending on what your assignment is asking students to compare (or in terms of what), students will benefit greatly from structured opportunities to create inventories or data sets of the motifs, examples, trajectories, etc., shared (or not shared) by the texts they'll be comparing. See the sample exercises below for a basic example of what this might look like.
• Why it Matters: Moving beyond "x is like y but also different" or even "x is more like y than we might think at first" is what moves an essay from being "compare/contrast" to being a comparative analysis . It's also a move that can be hard to make and that will often evolve over the course of an assignment. A great way to get feedback from students about where they're at on this front? Ask them to start considering early on why their argument "matters" to different kinds of imagined audiences (while they're just gathering evidence) and again as they develop their thesis and again as they're drafting their essays. ( Cover letters , for example, are a great place to ask writers to imagine how a reader might be affected by reading an their argument.)
• Structure: Having two texts on stage at the same time can suddenly feel a lot more complicated for any writer who's used to having just one at a time. Giving students a sense of what the most common patterns (AAA / BBB, ABABAB, etc.) are likely to be can help them imagine, even if provisionally, how their argument might unfold over a series of pages. See "Tips" and "Common Pitfalls" below for more information on this front.

Sample Exercises and Links to Other Resources

• Common Pitfalls
• Advice on Timing
• Try to keep students from thinking of a proposed thesis as a commitment. Instead, help them see it as more of a hypothesis that has emerged out of readings and discussion and analytical questions and that they'll now test through an experiment, namely, writing their essay. When students see writing as part of the process of inquiry—rather than just the result—and when that process is committed to acknowledging and adapting itself to evidence, it makes writing assignments more scientific, more ethical, and more authentic. 
• Have students create an inventory of touch points between the two texts early in the process.
• Ask students to make the case—early on and at points throughout the process—for the significance of the claim they're making about the relationship between the texts they're comparing.
• For coordinate kinds of comparative analysis, a common pitfall is tied to thesis and evidence. Basically, it's a thesis that tells the reader that there are "similarities and differences" between two texts, without telling the reader why it matters that these two texts have or don't have these particular features in common. This kind of thesis is stuck at the level of description or positivism, and it's not uncommon when a writer is grappling with the complexity that can in fact accompany the "taking inventory" stage of comparative analysis. The solution is to make the "taking inventory" stage part of the process of the assignment. When this stage comes before students have formulated a thesis, that formulation is then able to emerge out of a comparative data set, rather than the data set emerging in terms of their thesis (which can lead to confirmation bias, or frequency illusion, or—just for the sake of streamlining the process of gathering evidence—cherry picking). 
• For subordinate kinds of comparative analysis , a common pitfall is tied to how much weight is given to each source. Having students apply a theory (in a "lens" essay) or weigh the pros and cons of a theory against case studies (in a "test a theory") essay can be a great way to help them explore the assumptions, implications, and real-world usefulness of theoretical approaches. The pitfall of these approaches is that they can quickly lead to the same biases we saw here above. Making sure that students know they should engage with counterevidence and counterargument, and that "lens" / "test a theory" approaches often balance each other out in any real-world application of theory is a good way to get out in front of this pitfall.
• For any kind of comparative analysis, a common pitfall is structure. Every comparative analysis asks writers to move back and forth between texts, and that can pose a number of challenges, including: what pattern the back and forth should follow and how to use transitions and other signposting to make sure readers can follow the overarching argument as the back and forth is taking place. Here's some advice from an experienced writing instructor to students about how to think about these considerations:

a quick note on STRUCTURE

     Most of us have encountered the question of whether to adopt what we might term the “A→A→A→B→B→B” structure or the “A→B→A→B→A→B” structure.  Do we make all of our points about text A before moving on to text B?  Or do we go back and forth between A and B as the essay proceeds?  As always, the answers to our questions about structure depend on our goals in the essay as a whole.  In a “similarities in spite of differences” essay, for instance, readers will need to encounter the differences between A and B before we offer them the similarities (A d →B d →A s →B s ).  If, rather than subordinating differences to similarities you are subordinating text A to text B (using A as a point of comparison that reveals B’s originality, say), you may be well served by the “A→A→A→B→B→B” structure.  

     Ultimately, you need to ask yourself how many “A→B” moves you have in you.  Is each one identical?  If so, you may wish to make the transition from A to B only once (“A→A→A→B→B→B”), because if each “A→B” move is identical, the “A→B→A→B→A→B” structure will appear to involve nothing more than directionless oscillation and repetition.  If each is increasingly complex, however—if each AB pair yields a new and progressively more complex idea about your subject—you may be well served by the “A→B→A→B→A→B” structure, because in this case it will be visible to readers as a progressively developing argument.

As we discussed in "Advice on Timing" at the page on single-source analysis, that timeline itself roughly follows the "Sample Sequence of Formative Assignments for a 'Typical' Essay" outlined under " Formative Writing Assignments, " and it spans about 5–6 steps or 2–4 weeks. 

Comparative analysis assignments have a lot of the same DNA as single-source essays, but they potentially bring more reading into play and ask students to engage in more complicated acts of analysis and synthesis during the drafting stages. With that in mind, closer to 4 weeks is probably a good baseline for many single-source analysis assignments. For sections that meet once per week, the timeline will either probably need to expand—ideally—a little past the 4-week side of things, or some of the steps will need to be combined or done asynchronously.

What It Can Build Up To

Comparative analyses can build up to other kinds of writing in a number of ways. For example:

• They can build toward other kinds of comparative analysis, e.g., student can be asked to choose an additional source to complicate their conclusions from a previous analysis, or they can be asked to revisit an analysis using a different axis of comparison, such as race instead of class. (These approaches are akin to moving from a coordinate or subordinate analysis to more of a hybrid approach.)
• They can scaffold up to research essays, which in many instances are an extension of a "hybrid comparative analysis."
• Like single-source analysis, in a course where students will take a "deep dive" into a source or topic for their capstone, they can allow students to "try on" a theoretical approach or genre or time period to see if it's indeed something they want to research more fully.
• DIY Guides for Analytical Writing Assignments

• Types of Assignments
• Unpacking the Elements of Writing Prompts
• Formative Writing Assignments
• Single-Source Analysis
• Research Essays
• Multi-Modal or Creative Projects
• Giving Feedback to Students

Assignment Decoder

Essay Papers Writing Online

Tips and strategies for crafting a well-structured and insightful comparative essay.

When it comes to crafting a compelling comparative essay, it is crucial to navigate through the complexities of comparing and contrasting different subjects. This essay type challenges writers to critically analyze multiple perspectives, revealing both similarities and differences. By employing a systematic and meticulous approach, you can unlock the secrets behind writing a remarkable comparative essay. This step-by-step guide will provide you with the essential tools and techniques to create a well-structured, engaging, and thought-provoking piece of written work.

Exploring the art of comparison

The key to crafting an outstanding comparative essay lies in the art of comparison. This process involves analyzing and contrasting different aspects of the subjects under discussion, shedding light on their similarities and differences. By employing various literary devices and techniques, such as symbolism, imagery, and rhetorical devices, you can effectively convey your ideas and arguments to the reader. Additionally, diving deep into the historical, cultural, and social contexts of the subjects will provide you with invaluable insights, enriching your analysis and elevating the overall quality of your essay.

Structuring your essay for clarity and coherence

A well-structured essay is essential for clear communication and coherent flow of ideas. Begin your comparative essay with a compelling introduction that captures the reader’s attention and introduces the main subjects of comparison. Following this, dedicate separate paragraphs to each aspect or theme you wish to compare, ensuring you provide detailed evidence and analysis to support your arguments. Finally, conclude your essay by summarizing your main points and offering a balanced perspective, leaving the reader with a lasting impression.

Understanding the task requirements

Before beginning your comparative essay, it is essential to have a clear understanding of the assignment prompt. The instructions provided by your instructor or professor will give you insights into the specific criteria and expectations for your essay. By comprehending the task requirements, you can ensure that you stay focused and meet all the necessary criteria.

The assignment prompt may include details about the topic, the scope of the comparison, and any specific texts, sources, or themes that need to be addressed. It is crucial to read the prompt carefully and identify keywords or phrases that highlight the main objectives of the assignment. Understanding these key elements will help you define the boundaries of your essay and guide your research and analysis.

In addition to content requirements, the assignment prompt may also provide instructions regarding the format, structure, and length of the essay. Pay attention to any guidelines regarding the organization of your essay, such as whether to use a point-by-point or block method of comparison. Understanding the formatting expectations will ensure that your essay is well-structured and coherent.

By understanding the assignment prompt, you can begin your comparative essay with a clear direction and purpose. It allows you to select and analyze relevant material while adhering to the specific requirements set by your instructor. Taking the time to grasp the assignment prompt will ultimately lead to a more successful and cohesive essay.

Choose a clear and concise thesis

One of the most crucial steps in writing a comparative essay is selecting a clear and concise thesis statement. Your thesis statement serves as the main argument of your essay, guiding the reader through your points of comparison and analysis. It should be a well-defined statement that clearly states your position and sets the tone for the rest of your essay.

When choosing your thesis, it is important to consider the specific topic or prompt of your essay. Take the time to analyze the similarities and differences between the subjects or texts you are comparing and think about the main point you want to make. Your thesis should reflect this main point and provide a roadmap for your essay.

A clear and concise thesis statement not only helps you stay focused on your argument, but it also helps your readers understand the purpose of your essay. By clearly stating your position and guiding your readers through your points of comparison, you can ensure that your essay is well-organized and persuasive.

By taking the time to choose a clear and concise thesis statement, you can set yourself up for success in writing a strong comparative essay. Your thesis will not only guide your writing process but also provide a solid foundation for your analysis and interpretation of the subjects or texts you are comparing.

Conduct thorough research on both subjects

In order to write a compelling comparative essay, it is essential to conduct comprehensive research on both subjects being compared. By thoroughly investigating each subject, you will be able to identify their similarities, differences, and unique characteristics. This research is crucial for developing a well-informed and insightful analysis of the subjects, ensuring that your essay is both informative and engaging.

Start by gathering relevant information from a variety of credible sources, including books, journals, scholarly articles, and reputable websites. Take detailed notes as you explore each subject, making note of key concepts, important facts, and pertinent examples. This will help you build a solid foundation of knowledge about each subject and provide you with a comprehensive understanding of their respective contexts.

Furthermore, it is important to consider different perspectives and interpretations of each subject. Engage with a diverse range of sources that offer varying viewpoints, as this will enable you to develop a more nuanced understanding of the subjects and their significance. By evaluating different arguments and opinions, you will be able to construct a well-rounded comparative analysis that takes into account multiple perspectives.

Additionally, be sure to identify any potential biases or limitations in your sources and strive to include a balanced representation of information. This will help you present a fair and objective comparison of the subjects, allowing readers to form their own opinions based on the evidence you provide.

Ultimately, conducting thorough research on both subjects is essential for writing a successful comparative essay. By immersing yourself in the relevant literature and critically analyzing different viewpoints, you will be able to develop an in-depth understanding of the subjects and present a compelling analysis that highlights their similarities and differences. Through this detailed research process, you will be able to craft an informative and engaging essay that showcases your analytical skills and knowledge of the subjects at hand.

Outline your essay before writing

Before diving into the writing process, it is crucial to create an outline for your comparative essay. An outline serves as a roadmap that guides you throughout the essay, helping you organize and structure your thoughts in a logical and coherent manner.

When creating an outline, start by identifying the main points or themes that you want to compare and contrast in your essay. These can be specific elements or aspects of the subject matter that you find interesting or relevant. Once you have identified the main points, organize them in a logical order, considering the flow of your essay.

Next, break down each main point into subpoints or supporting evidence. These subpoints should provide more specific details that help to support your main points and strengthen your overall argument. Consider using examples, data, or evidence from reliable sources to support your claims and make your essay more persuasive.

As you create your outline, remember to maintain a clear and parallel structure. This means that each main point and subpoint should be phrased in a consistent manner. Use headings, subheadings, or formatting techniques such as numbering or bullet points to clearly delineate the different levels within your outline.

Furthermore, while creating your outline, be flexible and open to changes. It is common for your ideas and arguments to evolve as you research and analyze your subject matter more deeply. As a result, you may need to revise or reorganize your outline to accommodate any new insights or findings.

Finally, the outline should serve as a visual representation of your essay’s structure. It should provide you with a clear overview of the content and organization of your essay, making the writing process smoother and more efficient.

Use effective language and transitions

When writing a comparative essay, it is important to use effective language and transitions which can enhance the clarity and coherence of your arguments. By carefully choosing your words and utilizing proper transitions, you can create a seamless flow between your ideas and help your readers easily follow your train of thought.

One of the key aspects of using effective language is to be concise and direct in your writing. Instead of using excessive jargon or complex sentences, try to convey your ideas in a straightforward and understandable manner. This will not only make your essay more accessible to a wider range of readers but also make your arguments more convincing and persuasive.

In addition to using concise language, it is also crucial to use strong and persuasive words to express your ideas. By using words that convey a sense of certainty and confidence, you can make your arguments more compelling. For example, instead of saying “there might be a correlation between the two variables”, you can say “there is a clear correlation between the two variables”. This simple change in language can greatly enhance the impact of your arguments and make your essay more persuasive.

Furthermore, the effective use of transitions is essential for creating a cohesive and well-structured essay. Transitions act as bridges between different ideas and help readers understand the connection between them. By using transitional words and phrases such as “however”, “in contrast”, “similarly”, and “on the other hand”, you can clearly indicate the relationship between different points in your essay. These transitions will not only make your essay more coherent but also help your readers navigate through your arguments more easily.

In conclusion, using effective language and transitions is crucial for writing a successful comparative essay. By employing concise and direct language, as well as strong and persuasive words, you can make your arguments more persuasive. Additionally, by utilizing appropriate transitions, you can create a seamless flow between your ideas and enhance the overall coherence of your essay.

Provide evidence and examples to support your comparisons

When writing a comparative essay, it is essential to provide evidence and examples to back up your comparisons. This will help strengthen your arguments and make your essay more convincing. Without adequate evidence and examples, your comparisons may seem unsubstantiated and lack impact.

One way to provide evidence is to reference authoritative sources. Citing scholarly articles, books, or reputable websites can lend credibility to your arguments. These sources can provide factual information, expert opinions, or statistical data that support your comparisons. Be sure to properly cite these sources in your essay to avoid plagiarism.

In addition to using external sources, you can also rely on examples from the texts or materials that you are comparing. These examples can be specific quotes, scenes, or events that illustrate the similarities or differences between the subjects of your essay. By including these examples, you give your readers concrete evidence to consider and analyze.

When selecting evidence and examples, it is important to choose ones that are relevant and significant to your comparisons. This means that they should directly relate to the aspects or criteria that you are examining in your essay. Avoid including irrelevant or peripheral information that does not contribute to your main argument.

Furthermore, it is crucial to analyze and explain the evidence and examples you provide. Simply presenting them without any commentary or analysis will leave your comparisons feeling incomplete. Take the time to explain how the evidence supports your comparisons and what it reveals about the subjects being compared. This will help your readers understand the significance of your comparisons and the broader implications they may have.

In conclusion, providing evidence and examples is crucial when writing a comparative essay. By referencing authoritative sources and using examples from the texts or materials being compared, you can strengthen your arguments and make your essay more convincing. Remember to choose relevant and significant evidence, and to analyze and explain the evidence and examples you provide. These steps will help ensure that your comparisons are well-supported and persuasive.

Revise and edit your essay for clarity and coherence

Once you have completed a rough draft of your comparative essay, it’s important to dedicate time to revise and edit your work. This step is crucial in ensuring that your essay is clear and coherent, allowing your ideas to flow smoothly and making it easier for your readers to understand the points you are trying to convey.

During the revision process, focus on refining your essay’s structure and organization. Ensure that your introduction effectively introduces the topic and provides a clear thesis statement. Check that each paragraph is logically connected to the ones before and after it, using appropriate transitions to guide your readers through your comparison.

In addition to structure, pay attention to the clarity of your language and the coherence of your arguments. Use clear and concise sentences to express your ideas, avoiding unnecessary jargon or overly complex language. Make sure that your points are supported with evidence and examples, and that your analysis is thorough and well-reasoned.

As you revise, consider the overall flow and organization of your essay. Does each paragraph contribute to your central argument? Are there any parts that could be rearranged or omitted for clarity? Take the time to read your essay aloud or have someone else read it to you to identify any areas where the writing may be confusing or unclear.

Finally, pay attention to grammar, spelling, and punctuation errors. A polished and error-free essay indicates attention to detail and professionalism. Proofread your essay carefully, using online tools or asking a friend or colleague to review it for you. Correct any mistakes you find, ensuring that your essay is flawless and well-presented.

By revising and editing your essay for clarity and coherence, you can elevate the quality of your writing and enhance your ability to communicate your ideas effectively. Take the time to carefully review and refine your work, and you will be rewarded with a well-crafted comparative essay that engages and informs your readers.

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• Published: 05 September 2024

Comparative research on monitoring methods for nitrate nitrogen leaching in tea plantation soils

• Shenghong Zheng 1 , 2 ,
• Kang Ni 2 ,
• Hongling Chai 1 ,
• Qiuyan Ning 3 ,
• Chen Cheng 4 ,
• Huajing Kang 1 &
• Jianyun Ruan 2 , 5  

Scientific Reports volume  14 , Article number:  20747 ( 2024 ) Cite this article

Metrics details

• Plant ecology

Great concern has long been raised about nitrate leaching in cropland due to its possible environmental side effects in ground water contamination. Here we employed two common techniques to measure nitrate leaching in tea plantation soils in subtropical China. Using drainage lysimeter as a reference method, the adaptability of estimating drainage and nitrate leaching by combining the water balance equation with the suction cup technique was investigated. Results showed that the final cumulative leachate volume for the calculated and measured method was 721.43 mm and 729.92 mm respectively during the study period. However, nitrate concentration exerted great influence in the estimation of nitrate leaching from the suction cup-based method. The cumulative nitrate leaching loss from the lysimeter and suction cup-based method was 47.45 kg ha −1 and 43.58 kg ha −1 under lysimeter nitrate concentrations ranging from 7 mg L −1 to 13 mg L −1 , 156.28 kg ha −1 and 79.95 kg ha −1 under lysimeter nitrate concentrations exceeding 13 mg L −1 . Therefore, the suction cup-based method could be an alternative way of monitoring nitrate leaching loss within a range of 7–13 mg L −1 of nitrate concentrations in leachate. Besides, lower results occurred in suction cup samplers due to lack of representative samples which mainly leached via preferential flow when in strong leaching events. Thus, it is advisable to increase sampling frequency under such special conditions. The results of this experiment can serve as a reference and guidance for the application of ceramic cups in monitoring nitrogen and other nutrient-ion leaching in tea plantation soils.

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Introduction.

The intensive and extensive land-use activities associated with crops and animal production cause the most substantial anthropogenic source of nitrate, among which over-use of nitrogen fertilizer is one of the most contributing factors for nitrate pollution 1 , 2 . Compared with other crops, the tea plant (Camellia sinensis) requires an elevated nitrogen supply for the growth of tea shoots to enhance tea yield and quality 3 , 4 . The mean annual N application rate ranges from 281 to 745 kg ha −1 in the main tea production provinces in China. This means about 30% of the surveyed tea gardens applied excessive chemical fertilizers according to the current recommendation 5 . Meanwhile, higher N input levels increased concentrations of NO 3 − and NH 4 + in the 90–200 cm soil of the tea gardens, posing a high risk of N leaching loss in the tea gardens 6 . Thus, nitrate leaching from tea gardens should be of great concern for both scientists and producers.

In terms of monitoring methods for nitrate nitrogen leaching in agricultural soils, ceramic suction cup samplers and buried drainage lysimeters are the two most commonly employed techniques 7 . Ceramic suction cups are favored for their ease of installation and potential for repeated sampling at the same location 8 . They are deemed suitable for monitoring nitrate nitrogen leaching in non-structured soils 9 , 10 . However, ceramic suction cups are limited in their capacity to assess nitrate nitrogen concentrations only at specific soil depths and during particular sampling times 11 . This limitation makes it challenging to establish a comprehensive mass balance unless simultaneous quantification of soil water flux is undertaken. Additionally, characterized by low soil water retention and vulnerability to drought in coarse sandy soils, obtaining adequate sample volumes and capturing representative pore samples can be problematic 10 , 12 .

On the contrary, drainage lysimeters yield both the leachate volume and the nitrate nitrogen concentration, facilitating the calculation of nitrogen load passing below the defined soil layers. Other advantages embody larger sample volumes, enabling a representative sample of the soil pore network. Nonetheless, the installation and burial of drainage lysimeters traditionally introduce considerable soil disturbance, resulting in significant deviations from the original soil’s hydraulic properties and natural attributes, including the pathways for water and solute flow 13 . Strictly speaking, this approach constitutes a comprehensive method that integrates both temporal and spatial dimensions 14 . It thereby offers a more systematic and precise assessment of nitrogen leaching losses compared to other methodologies, which often capture relatively small-scale nitrogen leaching events and provide only a momentary glimpse into nitrogen leaching patterns 15 .

Due to the advantages and limitations inherent in both ceramic suction cup extraction and drainage lysimeter methodologies, these techniques are widely applied in empirical research. Several studies have also undertaken comparative analyses of their respective monitoring performance 10 , 12 , 13 . Nevertheless, extant research often relies on the ceramic suction cup approach to estimate nitrate nitrogen leaching quantities through multiplying the nitrate nitrogen concentration within the extracted solution by the measured volume obtained from the drainage lysimeter. This practice poses constraints on the application of the ceramic suction cup method, as the calculation of soil water flux becomes the key limiting factor when drainage lysimeter equipment is unavailable. Thus, it is imperative to explore alternative methods for calculating water flux and, on this basis, to conduct a comparative analysis of the two techniques. This approach is essential for promoting the practical utility and quantitative operability of the ceramic suction cup method.

Currently, there is limited research on localized nitrate nitrogen leaching in tea plantation soils, and a lack of comparative assessments of monitoring methods. In this study, we employed two methodologies, ceramic suction cup sampler and drainage lysimeters, to concurrently monitor nitrate nitrogen leaching in tea plantation soils. We put particular emphasis on the ceramic suction cup method, combined with a water balance equation, to evaluate the accuracy and efficacy of nitrate nitrogen leaching monitoring. Our objective is to provide insights and reference points for research efforts related to nitrogen leaching in tea plantation soils.

Materials and methods

Site description.

The field experiment was conducted at Tea Research Institute of Chinese Academy of Agricultural Sciences (TRI-CAAS) Experimental Station in Zhejiang province of China (29.74°N, 120.82°E). The experimental site has a typical subtropical monsoon climate, with 12.6 °C in mean annual temperature and 1200 mm yr −1 in annual total precipitation. Before the experiment, tea plants (clone variety Baiye1 and Longjing43, hereafter referred to BY1 and LJ43) were planted in rows (1.5 m between rows and 0.33 m between plants) at a density of approximately 6000 plants ha −1 and allowed to grow for 4 years in the research site. The soil at the site was acidic red soil, developed from granite parent material with a texture that is clay. Before the experiment, the surface (0–20 cm) soil properties were pH 4.47, SOC 5.71 g kg −1 , TN 0.47 g kg −1 , available potassium (AK) 20.42 g kg −1 , and low available phosphorus (AP) 1.48 g kg −1 .

Experimental design

The experiment included different nitrogen (N) treatment levels, ranging from 150 kg N ha −1 to 450 kg N ha -1 , with three replicates arranged in a randomized complete block design. Urea was used as the nitrogen fertilizer, and nitrogen fertilization was divided into spring (30% of the total), summer (20% of the total), and fall (50% of the total) applications. In addition to nitrogen, each plot received a one-time application of 90 kg ha −1 phosphorus (as P 2 O 5 ), 120 kg ha −1 potassium (as K 2 O), and 1200 kg ha −1 of organic fertilizer as a basal application. The phosphorus fertilizer used was calcium superphosphate (13% P 2 O 5 ), the potassium fertilizer was potassium sulfate (50% K 2 O), and the organic fertilizer was rapeseed cake (5% N). Fertilization was conducted during the fall season using manual trenching (10–15 cm depth). The required amount of fertilizer for each plot was evenly spread in the trench, followed by soil backfilling.

Sample collection method

Lysimeter installation and water sample collection.

Drainage lysimeters were installed in July 2015 in such a way that they were collected for a representative transect of the production bed. This involved digging pits with 1.5 m length × 1 m width × 1 m height in the middle of the tea plant rows. In case of the side-seepage of soil solution, each lysimeter pit was surrounded by a piece of plastic leather before soil backfilling. Each lysimeter was paired with two 1.5-m pipes among which one was for air passage and another was fitted with a 1.0-cm butyl rubber suction tube to allow extraction of the leachate collected at the bottom of the lysimeter by a vacuum pump. leachate was regularly removed bi-weekly by applying a partial vacuum (25–30 kpa) using a 10-L vacuum bottle placed in the vacuum line for each lysimeter. Leachate volume was determined gravimetrically and subsamples were collected from each bottle for drainage and nitrate analysis. Please refer to our previous study reported by Zheng et al. 16 for detailed information on the installation of lysimeters and the collection of water samples.

Soil solution extraction using ceramic suction cups

The soil solution extraction using the negative pressure ceramic suction cup method involved burying ceramic suction cups at a specific soil depth and connecting them to PVC pipes. Before sampling, a vacuum pump was used to create a vacuum inside the ceramic suction cup through the PVC pipe. This vacuum pressure allowed soil solution to be drawn into the ceramic suction cup, from which soil solution samples can then be extracted. In this experiment, ceramic suction cups were installed at a depth of 100 cm in the middle of tea rows. Four ceramic suction cups were placed horizontally at distances of − 0 cm, − 25 cm, − 50 cm, and − 75 cm from the tea tree roots. Before rainfall events, the ceramic suction cups were subjected to a vacuum pressure of approximately − 80 kPa to collect soil solution generated during rainfall. This sampling way was conducted simultaneously with the lysimeter method throughout the experiment.

Meteorological data were automatically collected by a weather station located about 100 m from the research site, and soil moisture was monitored using soil moisture sensors as described in our previous study reported by Zheng et al. 16 . The average temperature and rainfall during the experiment are shown in Fig.  1 . It can be observed from the figure that the total rainfall for March to December 2019 and January to June 2020 was 1374.60 mm and 1095 mm, respectively. The average daily temperature fluctuated within the range of 4.97 °C to 29.18 °C, with the highest daily average temperatures occurring in July and August and the lowest temperatures often emerging in December or January. Rainfall was most abundant from June to September, while November and December experienced lower levels of rainfall.

Total monthly precipitation and mean daily temperature by month from March 2019 to June 2020 at the research site.

Sample analysis and data processing

After filtering the collected soil solution and leachate samples, the nitrate nitrogen concentration, NO 3 − –N concentration, was determined using a UV dual-wavelength spectrophotometry method with wavelengths of 220 nm and 275 nm 17 , 18 .

For the calculation of nitrate nitrogen leaching amount (CL) from the leachate collector, it is calculated by multiplying the volume of the collected water sample by its nitrate nitrogen concentration, and the specific calculation method is as follows in Eq. ( 1 ).

where Ci is the measured NO 3 − –N concentration in the water sample, kg N L −1 , Vi is the volume of leachate collected per extraction. The numbers 1.5 and 1.0 represent the length and width of the lysimeter, m. 0.01 is the conversion factor.

For the ceramic cup method, we need to apply a water balance equation to calculate the water flux over a specific time period. After that, you can multiply it by the concentration of nitrate nitrogen in the extracting solution to obtain the nitrate nitrogen leaching amount. The specific calculation process is as follows in Eq. ( 2 ).

The cumulative nitrate nitrogen leaching amount (CLs) for the ceramic cup method can be calculated as follows:

where C ἰ and C ἰ+1 (kg N L −1 ) represent the average concentrations of nitrate nitrogen in the soil-extracting solution for two consecutive sampling times. n represents the total number of sampling events.

D represents the water flux over the time interval between the two sampling events, which can be calculated using the water balance equation as shown in Eq. ( 3 ).

where P is the precipitation (mm), I means the irrigation water quantity (mm), which is not relevant in this study and is not considered in the calculations. VR is the change in soil water storage (mm). D is the leachate flux (mm). ETc is the crop evapotranspiration (mm), calculated as ETc = kc* ET 0 , where ET 0 is the reference evapotranspiration for crops calculated from meteorological data according to FAO-56 Penman–Monteith equation 19 . The calculation of ET 0 can be simplified as follows in Eq. ( 4 ).

where ET 0 is the reference evapotranspiration (mm day −1 ), R n is the net radiation at the crop surface (MJ m −2  day −1 ), G is the soil heat flux density (MJ m −2  day −1 ), T is the mean daily air temperature at 2 m height (°C), u 2 is the wind speed at 2 m height (m s −1 ), e s is the saturation vapor pressure (kPa), e a is the actual vapor pressure (kPa), (es-ea) is the saturation vapor pressure deficit (kPa), ∆ is the slope vapor pressure curve (kPa °C −1 ), γ psychrometric constant (kPa °C −1 ), and 900 is the conversion factor.

Statistical data analysis was conducted using SPSS 22 software (SPSS Inc., New York, USA). One-way analysis of variance (ANOVA) was performed, followed by Duncan's post hoc test (p < 0.05 indicates significant differences, while p < 0.01 indicates highly significant differences). All graphs were generated using Sigmaplot 12.5 software (Systat Software Inc., Milpitas, USA).

Results and discussion

Comparison of drainage flux and leachate volume calculation.

During the experimental period from March 2019 to June 2020, 22 samples were taken both for BY1 and LJ43. The drainage flux for each sampling interval was calculated using the water balance equation. Based on the results from our previous study 16 , for BY1, Kc was set to 0.71 to calculate evapotranspiration. When the rainfall exceeded 78.02 mm, the drainage flux was fixed at the maximum value of 20.63 mm. For LJ43, Kc was set to 0.84 to calculate evapotranspiration, and when the rainfall reached or exceeded 90.98 mm, the drainage flux was fixed at the maximum value of 21.45 mm. For other rainfall levels, the drainage flux was calculated using the actual rainfall and the water balance equation. On this basis, the calculated drainage flux was compared and analyzed against the equivalent water depth calculated by converting the leachate volume extracted from the lysimeter (Lysimeter leachate). The equivalent water depth (mm) is calculated as the extracted water volume (L) divided by the lysimeter's area (1.5 m 2 in this study). The results are shown in Fig.  2 .

Correlation analysis of lysimeter leachate and calculated drainage ( a ) and comparison of cumulative leachate and cumulative calculated drainage ( b ) for the BY1 and LJ43 during the study period.

From Fig.  2 a, it can be observed that the volume data points for both methods are distributed close to the 1:1 line, indicating that the calculated drainage flux and the lysimeter leachate volume measurements are generally in good agreement. Furthermore, the total volume sums for both methods were calculated separately (Fig.  2 b). The results indicate that the cumulative calculated drainage flux for BY1 during the experimental period was 389.21 mm, slightly higher than the total lysimeter leachate volume measured at 367.77 mm. For LJ43, the total calculated drainage flux was 332.22 mm, slightly lower than the total lysimeter leachate volume of 362.15 mm. Finally, when combining all results for BY1 and LJ43, the total calculated drainage flux and the total lysimeter leachate volume were 721.43 mm and 729.92 mm, respectively, with the former only 1.16% lower than the latter. Therefore, the application of the water balance equation for soil drainage flux calculation demonstrated high accuracy and feasibility.

Comparison of soil solution and leachate nitrate nitrogen concentrations

A relationship was created with the nitrate nitrogen concentration of the lysimeter leachate during the experimental period as the x-axis and the nitrate nitrogen concentration of the soil solution extracted using the ceramic cup method as the y-axis. Additionally, a logarithmic transformation was applied to further analyze the impact of the two extraction methods on nitrate nitrogen concentration. The results are shown in Fig.  3 . It can be observed in Fig.  3 a that when the nitrate nitrogen concentration in the lysimeter leachate is less than 7 mg L −1 , all nitrate nitrogen concentrations in the soil solution extracted from the ceramic cup method are higher than those in the lysimeter leachate. Subsequently, as the nitrate nitrogen concentration in the lysimeter leachate increases from 7 mg L −1 to 13 mg L −1 , approximately half of the soil solution extracted from the ceramic cup method has a higher nitrate nitrogen concentration than the lysimeter leachate, while the other half has a lower nitrate nitrogen concentration. Then, when the nitrate nitrogen concentration in the lysimeter leachate exceeds 13 mg L −1 , all soil solution extracted using the ceramic cup method has a lower nitrate nitrogen concentration than the lysimeter leachate.

Correlation between ( a ) nitrate concentration from lysimeter and suction cup and ( b ) nitrate concentration from lysimeter and logarithmic conversion value of the ratio of nitrate concentration from lysimeter to suction cup nitrate concentration.

Further analysis was conducted by taking the ratio of the nitrate nitrogen concentrations in the lysimeter leachate and the soil solution extracted using the ceramic cup method as a real number, with a base of 2 for logarithmic transformation. The trend of this transformed value with respect to the nitrate nitrogen concentration in the lysimeter leachate is shown in Fig.  3 b. It is evident that as the nitrate nitrogen concentration in the lysimeter leachate increases, the logarithmic transformation value increases from its minimum value of − 3.51 to 1.93. The transformation value exhibits distinct trends and characteristics based on the grouping of nitrate nitrogen concentrations in the lysimeter leachate. When the lysimeter leachate concentration is less than 7 mg L −1 , the transformation value is consistently less than 0. When the lysimeter leachate concentration exceeds 13 mg L −1 , the transformation value is consistently greater than 0. However, when the lysimeter leachate concentration falls between 7 mg L −1 and 13 mg L −1 , both positive and negative transformation values coexist.

Comparison of nitrate nitrogen leaching between two methods

Similarly, a relationship was created with the nitrate nitrogen concentration of the lysimeter leachate (Lysimeter method) as the x-axis and the nitrate nitrogen concentration obtained using the ceramic cup method combined with the water balance equation (Ceramic cup method) as the y-axis. Additionally, a logarithmic transformation was applied to further analyze the impact of the two methods on nitrate nitrogen leaching. The results are shown in Fig.  4 . From Fig.  4 a, it can be observed that when the nitrate nitrogen concentration in the lysimeter leachate is less than 7 mg L −1 , almost all nitrate nitrogen leaching calculated using the ceramic cup method is higher than the nitrate nitrogen concentration in the lysimeter leachate. When the lysimeter leachate concentration falls between 7 mg L −1 and 13 mg L −1 , more than half of the nitrate nitrogen leaching calculated using the ceramic cup method is lower than the lysimeter method, while the other half is higher. Then, when the lysimeter leachate concentration exceeds 13 mg L −1 , all nitrate nitrogen concentrations calculated using the ceramic cup method are lower than the lysimeter leachate.

Correlation between ( a ) nitrate leaching from lysimeter and suction cup and ( b ) nitrate leaching from lysimeter and logarithmic conversion value of the ratio of nitrate leaching from lysimeter to suction cup nitrate leaching.

Further analysis was conducted by taking the ratio of the nitrate nitrogen concentrations in the lysimeter leachate and those calculated using the ceramic cup method as a real number, with a base of 2 for logarithmic transformation. The trend of this transformed value with respect to the nitrate nitrogen concentration in the lysimeter leachate is shown in Fig.  4 b. It is evident that the transformation value follows a trend highly similar to the concentration transformation trend mentioned above. As the nitrate nitrogen concentration in the lysimeter leachate increases, the logarithmic transformation value increases from its minimum value of − 3.51 to 1. This transformation value exhibits distinct trends and characteristics based on the grouping of nitrate nitrogen concentrations in the lysimeter leachate. When the lysimeter leachate concentration is less than 7 mg L −1 , the transformation value is consistently less than 0. When the lysimeter leachate concentration exceeds 13 mg L −1 , the transformation value is consistently greater than 0. However, when the lysimeter leachate concentration falls between 7 mg L −1 and 13 mg L −1 , both positive and negative transformation values coexist.

In addition, statistical analysis was performed on the total nitrate nitrogen leaching for each concentration group. The results indicate that when the lysimeter leachate concentration was less than 7 mg L −1 , the total nitrate nitrogen leaching obtained by the lysimeter method and the ceramic cup method is 22.24 kg ha −1 and 44.05 kg ha −1 , respectively. When the lysimeter leachate concentration fell between 7 mg L −1 and 13 mg L −1 , the total nitrate nitrogen leaching calculated by the lysimeter method and the ceramic cup method was 47.45 kg ha −1 and 43.58 kg ha −1 , respectively. When the lysimeter leachate concentration exceeded 13 mg L −1 , the total nitrate nitrogen leaching obtained by the lysimeter method and the ceramic cup method was 156.28 kg ha −1 and 79.95 kg ha −1 , respectively. In summary, there were differences in quantified nitrate nitrogen leaching losses between the two methods. If the lysimeter method was used as the standard, the ceramic cup method exhibited higher monitoring accuracy when the nitrate nitrogen concentration in the lysimeter leachate fell within the range of 7–13 mg L −1 .

Effect of rainfall on the application of the water balance model

The use of ceramic cup methods to monitor nitrate nitrogen leaching in farmland requires estimation of soil water flux through modeling. This inevitably introduces uncertainties in accurately quantifying nitrate nitrogen 20 . In this study, the application of a water balance model for quantitatively calculating soil drainage volume seemed to yield slightly lower water flux results compared to the corresponding measurements obtained through the lysimeter method, especially when rainfall was low (Fig.  2 a). One possible reason for this discrepancy could be that the water balance equation typically accounts for only the saturated flow above field capacity, neglecting unsaturated flow. However, it is reported that unsaturated flow, which occurs at lower soil moisture levels, is more common in practice, especially when rainfall is low and soil moisture levels remain relatively low 21 . Therefore, it is speculated that unsaturated flow is the primary reason for the water balance model calculating lower water flux than the lysimeter measurements under these conditions.

On the other hand, for conditions with higher rainfall intensity, when applying the water balance equation to estimate water flux, it should strictly include runoff as part of the water output, with the most accurate method being the construction of runoff tanks for precise measurement. However, this study lacked the necessary means to estimate runoff, which likely led to significant deviations in the final water flux calculations. Nevertheless, previous study reported that runoff typically occurs during heavy rainfall events and increases with higher rainfall amounts 22 , 23 , 24 and when a certain critical rainfall intensity is reached, water will be lost as runoff because the soil cannot absorb and retain it, and an eventual maximum leachate flux will occur 25 . Based on our previous study, critical rainfall amounts and maximum water leachate fluxes were determined for the tea varieties of Longjing 43 and BaiYe 1, thus mitigating the significant calculation bias arising from the absence of runoff monitoring.

Effect of soil texture on the accuracy of the suction cup-based method

The lysimeter method, being considered a relatively accurate technique for monitoring and quantifying soil nitrate nitrogen leaching, is often regarded as a true reflection of nitrate nitrogen leaching in soil 26 . This study indicated that when the nitrate nitrogen concentration in lysimeter leachate fell below 13 mg L -1 (especially within the range of 7–13 mg L −1 ), the ceramic cup method demonstrated relatively accurate monitoring results. However, when the leachate nitrate concentration exceeded 13 mg L −1 , A much lower result was obtained from the ceramic cup method compared to the lysimeter method. The reason for this may rely on the soil structure. From the perspective of soil texture, this experiment was conducted in a relatively heavy clay tea plantation, where the clay content within the top meter of soil ranged from 62.53 to 69.99% 16 . Under such soil conditions, nitrate nitrogen is likely to be transported downward through preferential flow. Preferential flow is characterized by the rapid movement of most soil water and solutes through the large and intermediate pores of the soil, bypassing the surface soil and moving downward 27 . Previous studies have found that the occurrence of preferential flow was much higher in clay soils than in sandy or loamy soils 28 , 29 , 30 . This often resulted in higher concentrations of nitrate nitrogen in leachate water 31 .

Ceramic cups, on the other side, have been reported to be unsuitable for use in clayey soils because the presence of preferential flow makes it difficult for ceramic cups to effectively collect water flowing through large pores, especially during heavy rainfall events 32 . Additionally, Barbee and Brown (1986) compared the performance of ceramic cups and lysimeters in monitoring chloride ions in soils with three different textures. The results showed that lysimeters generally provided higher and more stable monitoring results in loam and sandy loam soils, while ceramic cups were almost ineffective in clayey soils due to the rapid leaching and movement of water through large pores. Therefore, to some extent, ceramic cups were considered to be a flawed soil solution extraction technique for clayey soils. These factors need to be considered in soil nitrate nitrogen leaching studies, especially in soil types like clay, where choosing an appropriate solution extraction method is crucial for obtaining accurate data.

Conclusions

In comparison to direct measurements using lysimeters as a reference, the feasibility of the ceramic cup's negative pressure extraction estimation method was analyzed. The results demonstrated that the total calculated drainage flux and the total measured volume for lysimeter leachate were 721.43 mm and 729.92 mm, respectively, indicating that the application of the water balance equation for estimating soil drainage flux is accurate and feasible. Furthermore, through a comparative analysis of nitrate nitrogen concentrations in water samples collected by lysimeters and ceramic cups, it was observed that the ceramic cup method exhibited a certain accuracy in estimating nitrogen leaching, especially when the nitrate nitrogen concentration in lysimeter leachate fell within the range of 7–13 mg L −1 . However, under conditions of intense leaching (nitrate nitrogen concentration in lysimeter leachate exceeding 13 mg L −1 ), there was a risk of underestimation due to the potential lack of representative samples. Therefore, it is advisable to increase sampling frequency under such special circumstances.

Data availability

The datasets used and/or analyzed during the current study available from the corresponding author on reasonable request.

Abbreviations

Variety Baiye1

Variety Longjing43

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (2022YFF0606802) and the Earmarked Fund for China Agriculture Research System (CARS-19).

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Shenghong Zheng, Hongling Chai & Huajing Kang

Key Laboratory of Tea Biology and Resource Utilization of Tea (Ministry of Agriculture), Tea Research Institute, Chinese Academy of Agriculture Sciences, Hangzhou, 310008, China

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Lishui Academy of Agricultural and Forestry Sciences, Lishui, 323000, China

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College of Ecology, Lishui University, Lishui, 323000, China

Xihu National Agricultural Experimental Station for Soil Quality, Hangzhou, 310008, China

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Conceptualization: SZ and JR; writing-original draft preparation: SZ;Writing-review and editing: KN, HC and JR; formal analysis: QN and CC; resources: HK; funding acquisition: JR. All authors have read and agreed to the published version of the manuscript.

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Zheng, S., Ni, K., Chai, H. et al. Comparative research on monitoring methods for nitrate nitrogen leaching in tea plantation soils. Sci Rep 14 , 20747 (2024). https://doi.org/10.1038/s41598-024-71081-3

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DOI : https://doi.org/10.1038/s41598-024-71081-3

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