Richard, Great question. I feel that it depends on how the students have interacted with a particular class session. If an instructor has a perception that the students are not fully grasping the concepts of the lecture, it would be a good idea to debrief and provide a summary at the end of the class session, to ensure that they have a basic level of understanding. If the perception is that they understood the concepts, then it would be best to provide the debriefing during the next session, just to assess their retention of the information. Tremayne Simpson