If there is a high level of organization and self- responsibility, is not a problem to keep the students interested in the activity. The teams that finish their activity early can help each other on the following activity or task, speak silently or leave early. When the activity is exciting and interactive, the students will be so involved in it that the debate will continue even after the class is finished, as it observed Doug Duncan, astronomy and astrophysics professor at the University of Chicago.
Dr. Duncan gave a weekly challenge to small groups. The week he spoke about dynamics he challenged the students to predict what would happen if he let a bowling ball and metal marble fall. “I was informed that on that week many students were throwing objects from their room’s balcony. So at least something had occurred: I achieved one of my objectives. The students got interested on science and they enjoyed it, regardless of whether their prediction was correct or not.” he said.