The teacher can have students make hand gestures, that will tell the teacher whether the student has a comment or question concerning the lesson. This technique allows the teacher to have an idea about those students who may cause an unwanted tangent and those who may have a good question, pertaining to utilise the time effectively. When placing students in group-work, the teacher can walk around facilitating and listening to discussions of other students. The teacher can then intervene or take the group to a different track if required.