Thesis and Purpose Statements
Use the guidelines below to learn the differences between thesis and purpose statements
In the first stages of writing, thesis or purpose statements are usually rough or ill-formed and are useful primarily as planning tools.
A thesis statement or purpose statement will emerge as you think and write about a topic. The statement can be restricted or clarified and eventually worked into an introduction.
As you revise your paper, try to phrase your thesis or purpose statement in a precise way so that it matches the content and organization of your paper.
A thesis statement is a sentence that makes an assertion about a topic and predicts how the topic will be developed. It does not simply announce a topic: it says something about the topic.
Good: X has made a significant impact on the teenage population due to its . . .
Bad: In this paper, I will discuss X.
A thesis statement makes a promise to the reader about the scope, purpose, and direction of the paper. It summarizes the conclusions that the writer has reached about the topic.
A thesis statement is generally located near the end of the introduction. Sometimes in a long paper, the thesis will be expressed in several sentences or an entire paragraph.
A thesis statement is focused and specific enough to be proven within the boundaries of the paper. Key words (nouns and verbs) should be specific, accurate, and indicative of the range of research, thrust of the argument or analysis, and the organization of supporting information.
A purpose statement announces the purpose, scope, and direction of the paper. It tells the reader what to expect in a paper and what the specific focus will be.
Common beginnings include:
"This paper examines . . .," "The aim of this paper is to . . .," and "The purpose of this essay is to . . ."
A purpose statement makes a promise to the reader about the development of the argument but does not preview the particular conclusions that the writer has drawn.
A purpose statement usually appears toward the end of the introduction. The purpose statement may be expressed in several sentences or even an entire paragraph.
A purpose statement is specific enough to satisfy the requirements of the assignment. Purpose statements are common in research papers in some academic disciplines, while in other disciplines they are considered too blunt or direct. If you are unsure about using a purpose statement, ask your instructor.
This paper will examine the ecological destruction of the Sahel preceding the drought and the causes of this disintegration of the land. The focus will be on the economic, political, and social relationships which brought about the environmental problems in the Sahel.
Sample purpose and thesis statements
The following example combines a purpose statement and a thesis statement (bold).
The goal of this paper is to examine the effects of Chile's agrarian reform on the lives of rural peasants. The nature of the topic dictates the use of both a chronological and a comparative analysis of peasant lives at various points during the reform period. . . The Chilean reform example provides evidence that land distribution is an essential component of both the improvement of peasant conditions and the development of a democratic society. More extensive and enduring reforms would likely have allowed Chile the opportunity to further expand these horizons.
For more tips about writing thesis statements, take a look at our new handout on Developing a Thesis Statement.
Restrict your Specific Purpose to one idea only. In Speech 151 for the informative speech your general purpose is to inform. For an informative speech you will want to start your specific purpose statement with "I will inform my audience about...." A Specific Purpose Statement for an informative speech will be phrased much like the following statements. Click here for more examples of Specific Purposes, Central Ideas, and Main Points.
Informative speech specific purpose statements:
- I will inform my audience about the two major forms of hula.
- I will inform my audience about what lifegaurds do as part of their jobs.
When you have your specific purpose statement you are ready to compose your Thesis Statement/Central Idea (they are one in the same). This is the most important part of your speech. This is one sentence that encompasses the central idea of your speech.
Writing your thesis statement/central idea is a four step process:
- Choose your topic
- Determine your general purpose
- Write your specific purpose statement
- Tie it all together by composing a clear concise thesis statement/central idea
"The two major forms of hula that have played an important role in Hawaiian history and have developed into unique dances are the Kahiko and 'Auana."
"Lifegaurding is a great way to spend your days on the beach, but the work includes training, teaching, and lots of practice making it more challenging than what you see on "Baywatch."
Your next step is to compose the main points of your speech. Main points are complete sentences that create a dialogue with your audience. With your main points you want to create questions in the mind of your audience. You will answer the question in your support of your main points. You make a claim in your main points and you support your claim in your subpoints, sub-subpoints, sub-sub-subpoints and so on.
The following are examples of Main points:
Specific Purpose: I will inform my audience about the two major forms of hula.
Central Idea: "The two major forms of hula that have played an important role in Hawaiian history and have developed into unique dances are the Kahiko and 'Auana."
- (Main Point 1) "The ancient hula or Kahiko is a unique form of hula."
- (Main Point 2) "The Kahiko plays an improtant role in the history of Hawaii."
- (Main Point 3) "The 'Auana or modern hula has played an important role in Hawaiian history."
- (Main Point 4) "The 'Auana has developed into a unique form of dance and storytelling."