This document provides information about using exit slips in the classroom. It defines an exit slip as a short question or prompt that students complete at the end of a lesson to assess their understanding before leaving class. The exit slips allow teachers to quickly identify which students have mastered the material and which students need more help. Example exit slip prompts are provided to determine student knowledge, get feedback, or identify their "muddiest point". The document recommends using the information from exit slips to plan targeted lessons to reteach difficult concepts.