Hank, in what ways could you fill the full 90 minutes and not lecture at all? For some instructors this sounds like an impossible question but in reality the focus that has come out of research is the importance of engagement. You can engage your students for the full 90 minutes and not need any time to formerly lecture. The concept you may want to explore is called the guide on the side versus the sage on the stage. One such example is provided but there are many more: From Sage on the Stage to Guide on the Side Alison King College Teaching Vol. 41, No. 1 (Winter, 1993), pp. 30-35 Published by: Taylor & Francis, Ltd. Article Stable URL: http://www.jstor.org/stable/27558571 James Jackson