Problem: Troy is a hard worker and took to the point system from day 1. He looked over the available backup reinforcers and immediately identified two he wanted. He needed 115 points for the two items; he earned 145. On Friday he cashed in one item and banked his tokens for item two for the next Friday. During the second week Troy seemed to be in a world of his own rather than attending to math and science. Why is the teachers plan not working and what would you do to fix it?