As you may have seen in the videos from an earlier Tip, the role of the student has changed. Instead of listening to the teacher lecture and explain the mathematics for most of the period, the students do most of the sense–making and talking about the math. They explain their thinking about a problem to their teammates and to the teacher, when asked. An effective team allows everyone an opportunity to ask questions and explain their ideas. They listen to one another. Toward the end of class, students might be asked to explain to the rest of the class what learning has taken place. The teacher’s responsibility is to see that all students are engaged, involved, supported and that each student is moving forward in their understanding of the concepts and skills of the course. A teacher will check for understanding throughout the lesson but also at the end of the lesson so he or she knows how to plan for upcoming lessons.