A good expository paragraph is the key to clear written communication. A quality paragraph prepares the reader, presents the relevant data, and then summarizes the information. The opening sentences need to first identify the topic of the paragraph and then name the specific supports that are to be used. The body of the paragraph presents specific information that clarifies and provides examples of the topic. Lastly, the paragraph needs to summarize the evidence and close with a strong call to action. By preparing the reader, presenting strong relevant evidence and summarizing succinctly, a good writer can persuade or convince an astute reader. Good communication starts with a clear formula.