Examined stability of young children's behavior problems and effectiveness of Parent-Child Interaction Therapy in 32 families. Found no significant differences between waitlist-control and treatment groups at time of referral on Child Behavior Checklist, Eyberg Child Behavior Inventory, and Parenting Stress Index. Behavior of treatment group…

Clarifies details of research design and procedures in response to critiques of six longitudinal comparative studies from the Early Intervention Research Institute. The institute's investigations examined the effects and costs of early intervention for children with disabilities. (BB)