A post in another area got me to thinking about this. How would this work in a high school classroom - suppose you give the students free time at the end of class on Friday as a reward. But suppose there were one or two students that will not receive a reward. What do you do with those students, or have them work on, so that it's not considered free time - you can't really give them an extra assignment because I have read to never give school-related work as a punishment. You can't sit them in the corner Would something good be to have them maybe scrub down all the lab tables and sweep the floors, or what are some other ideas?