This document discusses thesis statements and how to write them effectively. It defines a thesis statement as a single sentence found in the introductory paragraph that presents the main argument or claim of the paper. The document provides guidelines for writing a strong thesis statement, such as making a clear claim, taking a position, and supporting the statement with evidence. It emphasizes the importance of research before writing a thesis and being willing to modify it based on what the evidence suggests. Examples are provided to illustrate good and bad thesis statements.