A therapeutically effective play group is one whose composition permits dynamic interaction to take place. A play group's potential for dynamic interaction, and its capacity for self-restoration following episodes of disequilibrium, are both determined by the psychological balance created through a proper grouping of problem types. The composition of the play group should be kept intact as much as possible. When indicated, changes should be made during the time of preplacement meetings, or soon after a group has been started. The therapeutic play group parallels other forms of therapy with respect to transient phenomena such as resistance. Refreshments are served at each play group meeting. For this purpose the play room should be equipped with suitable household supplies for use in the preparation and serving of food and for washing dishes. Communication in the play group takes place on verbal and nonverbal levels, the latter predominating.