A 5-yr-old preschool boy with a low rate of interaction with his nursery school classmates was induced to pass out candy as a tactic to increase his rate of interaction with them. Interaction with classmates increased markedly during the periods he passed out choices of candy. These changes may have been due to increases in both his rate of initiating activities with his classmates and to increases in his classmates' rate of initiating activities with him. A total time of less than 1 hr was required of the teacher during the experiment.