Sandra, To keep your students engaged you can develop a variety of instructional activities that will let your students reset their brains at frequent intervals. Delivery a mini-lecture of 15-20 minutes then do an activity like case study, role playing, small group or discussion. Then do another mini-lecture and activity. Students like change of pace and variety in their instructional delivery so the more you can vary your delivery the better. The results will be focused students for the duration of your class session. Gary Gary Meers, Ed.D.