Several years ago, I had a courteous, if troubling, e-mail exchange with the architect of a hugely popular instructional innovation. She had heard that I had been criticizing this approach. (I had.) In a series of e-mails, I explained my reasons, starting with the fact that there was no research or strong evidence to support its widespread adoption. I asked, with increasing importunity, for any such evidence. Only after multiple requests did I finally receive an answer: There was no solid research or school evidence.