Wait Time (The Single Highest-Impact Shift)
Ask a question. Then wait 3–5 seconds before accepting any response. No hands, no calling out.
Mary Budd Rowe's landmark 1986 research found that increasing wait time from under 1 second to 3+ seconds dramatically increased response length, accuracy, student-initiated questions, and participation from previously quiet students. Most teachers wait less than 1 second before calling on someone.
How to teach it: "I'm going to ask a question. When I'm done, everyone thinks silently. I'll signal when it's time to share." Use a visual countdown or simply hold up fingers.