Develop an outline that briefly summarizes your introduction, your body paragraphs, and your conclusion. The most conventional expository essay structure follows a five-paragraph organization: an introduction and thesis statement, three paragraphs elucidating the main point with supporting details, and a conclusion. However, you do not need to strictly follow this format.
Declare a thesis statement in the first paragraph. The thesis is important because here you will state the central point of the essay. Write the thesis concisely.
Insert clear, logical transitions between paragraphs. This is a point of both style and argument. Transitions should flow rhetorically (use words such as "moreover," "therefore," "additionally," and other terms to suggest the continuation of an argument), and they should proceed logically.
Incorporate supporting details in your expository essay. Such details serve to prove the central point you are conveying. They provide evidence in your argument that helps to convince the reader of your claims.
Maintain a formal, academic tone. Expository papers are rather impersonal in nature, and the tone of your writing should convey this. Avoid personal pronouns, such as "I," and write with an engaged but respectful distance from the subject. Expository papers are not anecdotal or personal responses to a subject.
Conclude the paper with a final paragraph that summarizes your points and decisively brings the flow of the text to a logical conclusion. Be concise but do not be afraid to inject a bit of rhetorical flair in this paragraph, since you want to leave your readers impressed.