At the beginning of summer band, we had a clinician come in to rehearse the marching band. Not only did he clinic the band, he taught the directors. All through rehearsal, when we would begin sitting back and not paying attention, he would come over and ask, "What did you learn?" We would all try to scramble for something that would really contribute, but he had caught us red handed. At the end of the day he came over and told me that during every rehearsal or class I teach I should constantly be asking these questions....
-What went well?
-What should be improved?
-What did I learn?
Those questions have stuck with me and at the end of my classes I evaluate how I did by using them. All I have to say is, what an eye opener!