This question did come up in my class. I said "if you do not want to take this opportunity seriously and would rather be graded on an assignment, I'll gladly as

This question did come up in my class. I said "if you do not want to take this opportunity seriously and would rather be graded on an assignment, I'll gladly assign you a different project for the rest of the year that I will grade you on." He stayed with the 20% project. The accountability is in the documentation and the presentations. More of a peer accountability than anything else (which I think is powerful). I'd be happy to hear any suggestions!