Mark, Great! Clickers (Klickerez) provide a great way to ask questions and solicit responses. Of course this tool can be a great way to faciltate discussions, augment Q&A activities, or use during review sessions. More traditional methods of assessing prior knowledge also are helpful to get an sense about what students know (or don't know) about a topic or category of learning. With that knowlege, planning for a class will be more focused and use what time is available more productively. Barry Westling