I work part-time as a test prep tutor. One of my friends once suggested that I should try to convince parents to give me extra money, which I would then offer t

I work part-time as a test prep tutor. One of my friends once suggested that I should try to convince parents to give me extra money, which I would then offer to pay to the child if s/he would teach another student of mine a few things... It's hard to deny that teaching something (well) forces you to learn it well. Has anyone heard of this being implemented meaningfully in a classroom anywhere? Also, I loved this line: "This is a problem we all face all the time, when we are expected to explain something. (Wife asks, 'How do we get to Valley Forge from home?' And husband, who does not want to admit he has no idea at all, excuses himself to go to the bathroom; he quickly Googles Mapquest to find out.)"