The present investigation purposed to examine the nature of the interaction of therapist and child in a play therapy situation, with particular reference to two groups of children, one with serious emotional problems, the other without such problems. The study involved the analysis of one therapist's behavior, and is therefore essentially exploratory. Several studies (I, 2, 3, 6, 7) have attempted to measure discrete aspects of therapist-child interaction, especially the child's responses to the therapist. In general, however, they have not analyzed the child's influence on the therapist's responses to the child, nor are they based on a measure of the minute-by-minute interaction between therapist and child. This study sought to provide information concerning such interaction in the play therapy situation.