Hello Everyone, The one sure way to tell if it is time to switch to another teaching style for the night is what I call the glassy eye syndrome technique. This syndrome has been around for years, and when you are paying attention to your class, you can easily spot this infliction by simply looking into the students' eyes. If all you see is a blank stare and someone staring at the clock about every 20 seconds, that is the best time to change things up a bit. One method that works really well is having group activities, as it helps students to gather their attention back to the subject and not our monotone voices.