Some Unpleasant Realities:

Students don't pay attention 40% of the time during lecture (Pollio, 1984)

The first 10 min, 70% retention, last 10 min, 20% retention (McKeachie, 1988).

4 months after taking an introductory Psych class, students knew only 8% more than students who never took the class (Rickard, Rogers, Ellis, and Beidleman, 1988).