I like the system of incentives approach - especially when it involves longer term planning and the DC's ability to choose to go after a particular prize. We have sometimes given stickers for completing something, and he goes to a very low-key (and wonderful!) karate class that gives "stripes" (pieces of colored duct tape) after each session. The karate teacher is so terrific that I think he could get away with giving high fives and the kids would respond. But the idea of working towards something you choose seems really good.
One feature of our Suzuki Cello class that is entering the decision is that it is, by comparison with some of the others described, rather time consuming. It involves a private lesson and a group lesson every week, plus an additional Dalcroze class every week. Three different sessions every week plus daily practice. Seems like a lot.
