Once you have chosen your topic and determined your purpose, you will need to make sure your topic is narrow. One of the hardest parts of writing a thesis statement is narrowing a speech from a broad topic to one that can be easily covered during a five- to seven-minute speech. While five to seven minutes may sound like a long time for new public speakers, the time flies by very quickly when you are speaking. You can easily run out of time if your topic is too broad. To ascertain if your topic is narrow enough for a specific time frame, ask yourself three questions.

Is your speech topic a broad overgeneralization of a topic?

Overgeneralization occurs when we classify everyone in a specific group as having a specific characteristic. For example, a speaker’s thesis statement that “all members of the National Council of La Raza are militant” is an overgeneralization of all members of the organization. Furthermore, a speaker would have to correctly demonstrate that all members of the organization are militant for the thesis statement to be proven, which is a very difficult task since the National Council of La Raza consists of millions of Hispanic Americans. A more appropriate thesis related to this topic could be, “Since the creation of the National Council of La Raza [NCLR] in 1968, the NCLR has become increasingly militant in addressing the causes of Hispanics in the United States.”

Is your speech’s topic one clear topic or multiple topics?

A strong thesis statement consists of only a single topic. The following is an example of a thesis statement that contains too many topics: “Medical marijuana, prostitution, and Women’s Equal Rights Amendment should all be legalized in the United States.” Not only are all three fairly broad, but you also have three completely unrelated topics thrown into a single thesis statement. Instead of a thesis statement that has multiple topics, limit yourself to only one topic. Here’s an example of a thesis statement examining only one topic: Ratifying the Women’s Equal Rights Amendment as equal citizens under the United States law would protect women by requiring state and federal law to engage in equitable freedoms among the sexes.

Does the topic have direction?

If your basic topic is too broad, you will never have a solid thesis statement or a coherent speech. For example, if you start off with the topic “Barack Obama is a role model for everyone,” what do you mean by this statement? Do you think President Obama is a role model because of his dedication to civic service? Do you think he’s a role model because he’s a good basketball player? Do you think he’s a good role model because he’s an excellent public speaker? When your topic is too broad, almost anything can become part of the topic. This ultimately leads to a lack of direction and coherence within the speech itself. To make a cleaner topic, a speaker needs to narrow her or his topic to one specific area. For example, you may want to examine why President Obama is a good public speaker.

Put Your Topic into a Declarative Sentence

You wrote your general and specific purpose. Use this information to guide your thesis statement. If you wrote a clear purpose, it will be easy to turn this into a declarative statement.

General purpose: To inform

Specific purpose: To inform my audience about the lyricism of former President Barack Obama’s presentation skills.

Your thesis statement needs to be a declarative statement. This means it needs to actually state something. If a speaker says, “I am going to talk to you about the effects of social media,” this tells you nothing about the speech content. Are the effects positive? Are they negative? Are they both? We don’t know. This sentence is an announcement, not a thesis statement. A declarative statement clearly states the message of your speech.

For example, you could turn the topic of President Obama’s public speaking skills into the following sentence: “Because of his unique sense of lyricism and his well-developed presentational skills, President Barack Obama is a modern symbol of the power of public speaking.” Or you could state, “Socal media has both positive and negative effects on users.”

Adding your Argument, Viewpoint, or Opinion

If your topic is informative, your job is to make sure that the thesis statement is nonargumentative and focuses on facts. For example, in the preceding thesis statement, we have a couple of opinion-oriented terms that should be avoided for informative speeches: “unique sense,” “well-developed,” and “power.” All three of these terms are laced with an individual’s opinion, which is fine for a persuasive speech but not for an informative speech. For informative speeches, the goal of a thesis statement is to explain what the speech will be informing the audience about, not attempting to add the speaker’s opinion about the speech’s topic. For an informative speech, you could rewrite the thesis statement to read, “Barack Obama’s use of lyricism in his speech, ‘A World That Stands as One,’ delivered July 2008 in Berlin demonstrates exceptional use of rhetorical strategies. 

On the other hand, if your topic is persuasive, you want to make sure that your argument, viewpoint, or opinion is clearly indicated within the thesis statement. If you are going to argue that Barack Obama is a great speaker, then you should set up this argument within your thesis statement.

For example, you could turn the topic of President Obama’s public speaking skills into the following sentence: “Because of his unique sense of lyricism and his well-developed presentational skills, President Barack Obama is a modern symbol of the power of public speaking.” Once you have a clear topic sentence, you can start tweaking the thesis statement to help set up the purpose of your speech.

Thesis Checklist

Once you have written a first draft of your thesis statement, you’re probably going to end up revising your thesis statement a number of times prior to delivering your actual speech. A thesis statement is something that is constantly tweaked until the speech is given. As your speech develops, often your thesis will need to be rewritten to whatever direction the speech itself has taken. We often start with a speech going in one direction, and find out through our research that we should have gone in a different direction. When you think you finally have a thesis statement that is good to go for your speech, take a second and make sure it adheres to the criteria shown below.

Thesis Checklist