Depending on the size of your class, some people may be intimidated by speaking in what seems to them to be a large group. So consider dividing your class into groups of two or three, and allow-ing time for the small group to discuss the topic. Then ask for volunteers from the small groups to present to the class. You might follow that with something like, “Did any other group have some ideas that have not been presented to the entire group yet?” This can be another way to enlarge your participation pool.