Teacher Preparation Programs and Teacher Quality: Are There Real Differences Across Programs?

We compare teacher preparation programs in Missouri based on the effectiveness of their graduates in the classroom. The differences in effectiveness between teachers from different preparation programs are much smaller than has been suggested in previous work. In fact, virtually all of the variation in teacher effectiveness comes from within-program differences between teachers. Prior research has overstated differences in teacher performance across preparation programs by failing to properly account for teacher sampling.