This document provides guidance on how to write an effective thesis statement. It explains that a thesis statement must have two parts: a subject and an opinion about that subject. It emphasizes that a thesis statement is not just a title, announcement of the subject, or statement of fact. A good thesis statement is restricted to a narrow topic, expresses a single unified idea, and is specific rather than vague. The document also notes that an effective thesis statement serves as a test of whether the main idea meets these requirements and acts as a reminder of the central point the paper aims to make.