Mary Budd Rowe timed it in the seventies. After asking a question, the average teacher waits about nine-tenths of a second before rephrasing it, answering it, or calling on someone. Under a second. When she trained teachers to wait three to five seconds, several things changed at once, and none of them were small. Answers got longer — often three to seven times longer. The number of students volunteering went up sharply. Students started responding to each other rather than only to the teacher. Teachers’ own questions got better, because they were no longer filling silence with the next thing that came to mind. The gap between the students a teacher had rated strong and weak narrowed. Why a second is not enough Because forming a considered answer to a non-trivial question takes longer than a second, and everyone knows it. So the question effectively becomes: who already has a response ready? That is a real skill, but it is a narrow one, and it is unevenly distributed in ways that have very little to do with understanding — confidence, fluency in the language of instruction, whether you are comfortable being wrong in public, whether you had breakfast. A one-second wait does not select for the students who understand. It selects for the students who are quick and unafraid. Those overlap, but not nearly as much as the classroom makes it look. Silence after a question is not a failure of the question. It is the question working. Why it is so hard I have been doing this sixteen years and I still have to actively resist. Silence in a classroom is genuinely unpleasant to stand in. It reads as a stall, as lost authority, as thirty adolescents deciding you have mismanaged the moment. It is none of those. But knowing that intellectually does not make five seconds feel like five seconds. It feels like twenty. What helped Two practical things, both slightly embarrassing and both effective. First, I count. Silently, on my fingers, behind my back. It sounds ridiculous and it is the only reliable method I have found, because my sense of elapsed time in front of a class is simply not trustworthy. Second, I tell them what I am doing. "I am going to ask something, and then I am going to wait, and the silence is on purpose." Said once at the start of a year, it converts the pause from an awkwardness into a convention — and after a few weeks they stop finding it strange and start using the time. There is a second wait, incidentally, that Rowe also measured and that almost nobody practises: the pause after a student finishes speaking, before you respond. Three seconds there and they will very often keep going, and the second half is usually the better half.
