I've seen this before and apologize that I don't know who the original genius behind this was. I told the kids at the beginning of the year that for each compliment they get (from another teacher or administrator) , we will add a link to our chain. When the chain hits the ground we will have a class party! They are doing AWESOME, we're almost there. I'm not a huge fan of external motivation, I would rather it be intrinsic. I am a huge fan of positive praise however, and this is a great way to celebrate compliments and positive praise. It also makes the class have to work together as a team in order to earn compliments, I'm all about that!