Students ask more questions. Students propose more investigations. Student achievement improves. Classroom discipline improves. Teachers ask fewer questions.
Teachers ask better questions, requiring higher-order thinking skills.
The first wait-time interval is important to allow a student to consider a question and formulate a response. Dr. Rowe did her research in hundreds of elementary school science classrooms. It has been replicated many times at all educational levels. The results have been extraordinarily and consistently the same. Experience with concrete objects should precede reading about them.