Research and Development
Research your assigned topic to narrow the focus. Gather your information logically and begin to develop an argument. Choose a clear topic and research it thoroughly, which will ensure that once you write the thesis, you can support the stance of the thesis sentence through the entire paper. As research occurs, the claim you make as a writer will start to take shape.
Type of Essay
The type of essay you write will determine the stance of your thesis sentence. Analytical papers break down an issue into smaller parts, evaluate the situation and then present that information to the reader. An expository essay explains or exposes a topic. An argumentative paper makes a claim about a specific topic and then justifies the claim to the audience. All three essay types will require a thesis sentence that is the nub of the dissertation.
Write the Thesis
Use clear, concise language when you write your thesis statement. Use the third-person point of view, a strong verb and vivid adjectives. Make your thesis statement declarative -- state specifically what the paper will cover and give a sense of how you will cover the information. Avoid wordiness, cliches and first- or second-person usage when writing a thesis.
Rewrite if necessary. Once the pieces of the puzzle are put together and you write the entire paper, you may realize that your original thesis sentence may not fit as a road map for the entire paper. In this case, rewrite the thesis to accommodate new material and new angles that have developed through the process. Stick closely to the flow of the entire paper while revising the thesis sentence to ensure that the writing is organized.