A pdf version of the reliable 3-2-1 Exit Slip format! Include objectives/instructions at the top for students. Rules listed include that students are NOT permitted to use their notes and must work quietly/individually. This helps you truly discover concepts that may need retaught.
The empty space near the bottom I will occasionally have students utilize by assessing themselves and tell me what grade they think they would receive on the topic if quizzed in that moment, and why they believe they would receive that grade. It serves as great self-reflection for the students.