I take a small poster and cut it into ten jigsaw puzzle type pieces. I then put the pieces in a colorful folder pinned to a bulletin board. When the whole class has really great behavior (ie works hard in groups without any disagreements) they earn a piece. They may also earn a piece if they receive a compliment from an adult on the whole class behavior. To keep it honest I tell them that I need to hear the compliment from the adult. The aides in my building know I do this so they make a point of telling me when my class is really good in the cafeteria or outside. The music and PE teachers also drop me notes or e-mail me to let me know. When a puzzle is complete, the class earns a treat of some kind-candy, popcorn, longer recess, or free trips to the treasure chest for everyone. It also makes a great year around bulletin board since all I have to do is switch out the puzzle pieces in the folder. The caption reads "Good behavior puts it all together!" To add to the fun I never tell the kids what the poster is. They have fun guessing as I add pieces.