This document discusses the Just-in-Time Teaching (JiTT) instructional strategy. JiTT involves students completing online pre-class assignments called "WarmUps" that consist of conceptual questions about the upcoming material. The instructor reviews student responses just before class to modify their lesson plan as needed. Research shows JiTT improves student preparation and engagement compared to traditional lectures. The document advocates adopting JiTT and provides guidance on writing effective WarmUp questions and incorporating student feedback into class discussions to improve learning.