I am on my way to speak at another professional development day at a college. I do these events with misgivings—frequently persuading myself on the way home that I really shouldn’t be doing them. Some time ago, a colleague and I reviewed the literature on interventions to improve instruction. If I were to do that paper again, I would pay special attention to those changes that improved student learning. The research we looked at then did not give workshops very high marks. If teachers changed, they did so right after the event, but soon reverted to their old ways of doing things