Vanessa, As instructors, we usually have a game plan for the day, and it may include some loose time for incidentals such as Q&A, and reengagement activities. For me, I try to get students back on task quickly so as to lose as little time as possible. Although sometimes its necessary to do a whole change up (different activity), I find by briefly asking students questions, or telling an interesting story that pertains to the profession, that is usually enough to capture attention so I can get back to my planned activity. Barry Westling