I am going to start this this year (have not figured out the name yet) but I was wondering do you have the students only work on this in class when they are done with other work? I see a problem if I post the questions on a web site. I am afraid the parents will do most of the work just so little Susie can get the "T-Shirt." This will defeat the purpose so I am wondering how to do this. How has it worked in your class?