Outline the main topics that you want to cover in your essay. Before you write a thesis sentence for a comparison essay, you should have a strong sense of the comparisons you plan to make throughout your paper. You should also take note of any differences you may want to highlight in the essay.
Find concrete examples to back up your arguments. You will not need to include these examples in your thesis statement, but it is important to find examples in order to ensure that you choose ideas you will be able to discuss with firm evidence.
At the beginning of your thesis statement, designate the subjects you will compare. This will introduce your audience to the subject of your paper. If you are comparing two novels, for example, be sure to include both titles and authors in the sentence so there is no confusion.
List the similarities and differences that will be your focus throughout the paper. You should briefly summarize each similarity and difference and avoid writing a run-on sentence. Highlight only the main points that will later serve as the topic sentences for each of your main paragraphs.
Do not include details in your thesis statement. Because you need to mention each of the main points you will discuss, it is important to leave out specific details. Don't worry about giving your reader all the information you have to offer. You can do that in the body of your paper.