This document defines a thesis statement and provides guidance on developing an effective one. A thesis is the central idea or argument of a paper in the form of a complete sentence. It should directly answer the question "So what?" and convince readers of the paper's significance. The document offers strategies for crafting a working thesis such as rephrasing the topic as a statement, using "I" statements, or choosing a sentence from a draft. Examples of weak and strong thesis statements are also provided.