This document discusses primary sources and their use in lessons. It defines primary sources as materials created during a specific time period, including first-hand accounts, government documents, photographs, letters, diaries, and more. The benefits of using primary sources are that they allow students to gain perspectives from the time period and learn how to analyze information. The document provides tips for introducing primary sources in lessons, such as comparing them to textbook information or showing how the format has changed over time. Primary sources can play various roles in lessons, like providing context and viewpoints to hone analytical skills.