Principal Josette Claudio of P.S. 109 in the Bronx faced a problem. More than a third of her teachers had quit over one summer, possibly, according to surveys, because they were dissatisfied with the discipline in the school. Claudio had programs in place to encourage good behavior so teachers could concentrate on classroom instruction, but some had not taken hold. For example, her “Claudio Cash” program, which rewards well-behaved students with tokens they can redeem for pencils, books, or other trinkets from a Claudio Cash store set up in the building, was faltering because several staff members didn’t see it as a priority and wouldn’t show up to staff the store. As a result, rewards students had been promised would languish behind locked doors, frustrating