Purdue Online Writing Lab Purdue OWL® College of Liberal Arts
Developing Strong Thesis Statements
Welcome to the Purdue OWL
This page is brought to you by the OWL at Purdue University. When printing this page, you must include the entire legal notice.
Copyright ©1995-2018 by The Writing Lab & The OWL at Purdue and Purdue University. All rights reserved. This material may not be published, reproduced, broadcast, rewritten, or redistributed without permission. Use of this site constitutes acceptance of our terms and conditions of fair use.
The thesis statement or main claim must be debatable
An argumentative or persuasive piece of writing must begin with a debatable thesis or claim. In other words, the thesis must be something that people could reasonably have differing opinions on. If your thesis is something that is generally agreed upon or accepted as fact then there is no reason to try to persuade people.
Example of a non-debatable thesis statement:
This thesis statement is not debatable. First, the word pollution implies that something is bad or negative in some way. Furthermore, all studies agree that pollution is a problem; they simply disagree on the impact it will have or the scope of the problem. No one could reasonably argue that pollution is unambiguously good.
Example of a debatable thesis statement:
This is an example of a debatable thesis because reasonable people could disagree with it. Some people might think that this is how we should spend the nation's money. Others might feel that we should be spending more money on education. Still others could argue that corporations, not the government, should be paying to limit pollution.
Another example of a debatable thesis statement:
In this example there is also room for disagreement between rational individuals. Some citizens might think focusing on recycling programs rather than private automobiles is the most effective strategy.
The thesis needs to be narrow
Although the scope of your paper might seem overwhelming at the start, generally the narrower the thesis the more effective your argument will be. Your thesis or claim must be supported by evidence. The broader your claim is, the more evidence you will need to convince readers that your position is right.
Example of a thesis that is too broad:
There are several reasons this statement is too broad to argue. First, what is included in the category "drugs"? Is the author talking about illegal drug use, recreational drug use (which might include alcohol and cigarettes), or all uses of medication in general? Second, in what ways are drugs detrimental? Is drug use causing deaths (and is the author equating deaths from overdoses and deaths from drug related violence)? Is drug use changing the moral climate or causing the economy to decline? Finally, what does the author mean by "society"? Is the author referring only to America or to the global population? Does the author make any distinction between the effects on children and adults? There are just too many questions that the claim leaves open. The author could not cover all of the topics listed above, yet the generality of the claim leaves all of these possibilities open to debate.
Example of a narrow or focused thesis:
In this example the topic of drugs has been narrowed down to illegal drugs and the detriment has been narrowed down to gang violence. This is a much more manageable topic.
We could narrow each debatable thesis from the previous examples in the following way:
Narrowed debatable thesis 1:
This thesis narrows the scope of the argument by specifying not just the amount of money used but also how the money could actually help to control pollution.
Narrowed debatable thesis 2:
This thesis narrows the scope of the argument by specifying not just what the focus of a national anti-pollution campaign should be but also why this is the appropriate focus.
Qualifiers such as " typically ," " generally ," " usually ," or " on average " also help to limit the scope of your claim by allowing for the almost inevitable exception to the rule.
Types of claims
Claims typically fall into one of four categories. Thinking about how you want to approach your topic, or, in other words, what type of claim you want to make, is one way to focus your thesis on one particular aspect of your broader topic.
Claims of fact or definition: These claims argue about what the definition of something is or whether something is a settled fact. Example:
Claims of cause and effect: These claims argue that one person, thing, or event caused another thing or event to occur. Example:
Claims about value: These are claims made of what something is worth, whether we value it or not, how we would rate or categorize something. Example:
Claims about solutions or policies: These are claims that argue for or against a certain solution or policy approach to a problem. Example:
Which type of claim is right for your argument? Which type of thesis or claim you use for your argument will depend on your position and knowledge of the topic, your audience, and the context of your paper. You might want to think about where you imagine your audience to be on this topic and pinpoint where you think the biggest difference in viewpoints might be. Even if you start with one type of claim you probably will be using several within the paper. Regardless of the type of claim you choose to utilize it is key to identify the controversy or debate you are addressing and to define your position early on in the paper.
Home / Guides / Writing Guides / Parts of a Paper / How to Write a Strong Thesis Statement
How to Write a Strong Thesis Statement
A thesis can be found in many places—a debate speech, a lawyer’s closing argument, even an advertisement. But the most common place for a thesis statement (and probably why you’re reading this article) is in an essay.
Whether you’re writing an argumentative paper, an informative essay, or a compare/contrast statement, you need a thesis. Without a thesis, your argument falls flat and your information is unfocused. Since a thesis is so important, it’s probably a good idea to look at some tips on how to put together a strong one.
Guide Overview
What is a “thesis statement” anyway.
- 2 categories of thesis statements: informative and persuasive
- 2 styles of thesis statements
- Formula for a strong argumentative thesis
- The qualities of a solid thesis statement (video)
You may have heard of something called a “thesis.” It’s what seniors commonly refer to as their final paper before graduation. That’s not what we’re talking about here. That type of thesis is a long, well-written paper that takes years to piece together.
Instead, we’re talking about a single sentence that ties together the main idea of any argument . In the context of student essays, it’s a statement that summarizes your topic and declares your position on it. This sentence can tell a reader whether your essay is something they want to read.
2 Categories of Thesis Statements: Informative and Persuasive
Just as there are different types of essays, there are different types of thesis statements. The thesis should match the essay.
For example, with an informative essay, you should compose an informative thesis (rather than argumentative). You want to declare your intentions in this essay and guide the reader to the conclusion that you reach.
To make a peanut butter and jelly sandwich, you must procure the ingredients, find a knife, and spread the condiments.
This thesis showed the reader the topic (a type of sandwich) and the direction the essay will take (describing how the sandwich is made).
Most other types of essays, whether compare/contrast, argumentative, or narrative, have thesis statements that take a position and argue it. In other words, unless your purpose is simply to inform, your thesis is considered persuasive. A persuasive thesis usually contains an opinion and the reason why your opinion is true.
Peanut butter and jelly sandwiches are the best type of sandwich because they are versatile, easy to make, and taste good.
In this persuasive thesis statement, you see that I state my opinion (the best type of sandwich), which means I have chosen a stance. Next, I explain that my opinion is correct with several key reasons. This persuasive type of thesis can be used in any essay that contains the writer’s opinion, including, as I mentioned above, compare/contrast essays, narrative essays, and so on.
2 Styles of Thesis Statements
Just as there are two different types of thesis statements (informative and persuasive), there are two basic styles you can use.
The first style uses a list of two or more points . This style of thesis is perfect for a brief essay that contains only two or three body paragraphs. This basic five-paragraph essay is typical of middle and high school assignments.
C.S. Lewis’s Chronicles of Narnia series is one of the richest works of the 20th century because it offers an escape from reality, teaches readers to have faith even when they don’t understand, and contains a host of vibrant characters.
In the above persuasive thesis, you can see my opinion about Narnia followed by three clear reasons. This thesis is perfect for setting up a tidy five-paragraph essay.
In college, five paragraph essays become few and far between as essay length gets longer. Can you imagine having only five paragraphs in a six-page paper? For a longer essay, you need a thesis statement that is more versatile. Instead of listing two or three distinct points, a thesis can list one overarching point that all body paragraphs tie into.
Good vs. evil is the main theme of Lewis’s Narnia series, as is made clear through the struggles the main characters face in each book.
In this thesis, I have made a claim about the theme in Narnia followed by my reasoning. The broader scope of this thesis allows me to write about each of the series’ seven novels. I am no longer limited in how many body paragraphs I can logically use.
Formula for a Strong Argumentative Thesis
One thing I find that is helpful for students is having a clear template. While students rarely end up with a thesis that follows this exact wording, the following template creates a good starting point:
___________ is true because of ___________, ___________, and ___________.
Conversely, the formula for a thesis with only one point might follow this template:
___________________ is true because of _____________________.
Students usually end up using different terminology than simply “because,” but having a template is always helpful to get the creative juices flowing.
The Qualities of a Solid Thesis Statement
When composing a thesis, you must consider not only the format, but other qualities like length, position in the essay, and how strong the argument is.
Length: A thesis statement can be short or long, depending on how many points it mentions. Typically, however, it is only one concise sentence. It does contain at least two clauses, usually an independent clause (the opinion) and a dependent clause (the reasons). You probably should aim for a single sentence that is at least two lines, or about 30 to 40 words long.
Position: A thesis statement always belongs at the beginning of an essay. This is because it is a sentence that tells the reader what the writer is going to discuss. Teachers will have different preferences for the precise location of the thesis, but a good rule of thumb is in the introduction paragraph, within the last two or three sentences.
Strength: Finally, for a persuasive thesis to be strong, it needs to be arguable. This means that the statement is not obvious, and it is not something that everyone agrees is true.
Example of weak thesis:
Peanut butter and jelly sandwiches are easy to make because it just takes three ingredients.
Most people would agree that PB&J is one of the easiest sandwiches in the American lunch repertoire.
Example of a stronger thesis:
Peanut butter and jelly sandwiches are fun to eat because they always slide around.
This is more arguable because there are plenty of folks who might think a PB&J is messy or slimy rather than fun.
Composing a thesis statement does take a bit more thought than many other parts of an essay. However, because a thesis statement can contain an entire argument in just a few words, it is worth taking the extra time to compose this sentence. It can direct your research and your argument so that your essay is tight, focused, and makes readers think.
EasyBib Writing Resources
Writing a paper.
- Academic Essay
- Argumentative Essay
- College Admissions Essay
- Expository Essay
- Persuasive Essay
- Research Paper
- Thesis Statement
- Writing a Conclusion
- Writing an Introduction
- Writing an Outline
- Writing a Summary
EasyBib Plus Features
- Citation Generator
- Essay Checker
- Expert Check Proofreader
- Grammar Checker
- Paraphrasing Tools
Plagiarism Checker
- Spell Checker
How useful was this post?
Click on a star to rate it!
We are sorry that this post was not useful for you!
Let us improve this post!
Tell us how we can improve this post?
Grammar and Plagiarism Checkers
Grammar Basics
Plagiarism Basics
Writing Basics
Upload a paper to check for plagiarism against billions of sources and get advanced writing suggestions for clarity and style.
Get Started
IMAGES
VIDEO
COMMENTS
50 Argumentative Essay Thesis Statement Examples. A thesis statement in an argumentative essay needs to present a point of view. The biggest mistake you can make is to provide a thesis statement that doesn’t demonstrate what your argument will be.
The thesis statement or main claim must be debatable. An argumentative or persuasive piece of writing must begin with a debatable thesis or claim. In other words, the thesis must be …
15 Thesis Statement Examples. Below are 15 debatable, supportable, and focused thesis statements for you to learn from. Feel free to customize them for use in your own …
Whether you’re writing an argumentative paper, an informative essay, or a compare/contrast statement, you need a thesis. Without a thesis, your argument falls flat and your information …
Summary: A strong thesis statement is crucial for academic essays, guiding the argument and focus. To write an effective thesis, narrow your topic, ensure it's debatable, and …
Thesis statements for argumentative and expository essays should use strong and decisive language; don’t be wishy-washy or uncertain. You want to take a stand right in the …