I want to have a friendly competition between my 5 classes (all the same class), in which I will buy the winning class a coffee and bagel breakfast on the half day before winter break (next Friday). I want to use it as an extra motivator for them to study and prepare for our big cumulative assessment that occurs next Tuesday (almost like a trimester, but not called that). I am struggling with how to determine the "winning" class though. I don't just want to do the class with the highest average as that wouldn't be fair as one of my class is loaded with all honors drop-downs, and they always have an average a good 10% higher than the other classes. I was thinking of doing the class that is the "most improved", but I am struggling with thinking about "improved from what?" Plus that has the reverse effect as it is harder for my best class to improve as their grades are already so high. Hmmm....anyone have any thoughts on how I can do this fairly?