Teachers were trained to use reinforcement and induction to increase prosocial behavior in a sample of 98 children in Head Start-affiliated preschools, using a peer coaching model. There was one control group and three intervention groups: reinforcement-only, induction-only, and reinforcement-and-induction. Results indicated that the intervention groups showed a significant increase in total classroom prosocial behavior compared to the control group. The induction-only group increased dramatically in affection. The reinforcement-only group increased more in helping, sharing, and cooperation than in affection and comforting. Teacher behaviors in the classroom did not reflect conclusively that they were using the intervention strategies, possibly due to inadequate measurement. (Contains 4 tables.)