This document discusses the structure and purpose of paragraphs. It states that topic sentences are useful for arguments and analysis essays to help develop the main idea. Supporting sentences then provide details and examples to develop the main idea expressed in the topic sentence. Concluding sentences wrap up the paragraph and link it to the next. When incorporating sources, writers need to back up their ideas with evidence from sources, while properly citing words and ideas from other sources. The document outlines the purpose of introductory, body, and concluding paragraphs in developing an argument.