Describes characteristics of second-generation research in early intervention, that is, greater specificity, the use of more rigorous scientific standards, and an increased understanding of biosocial relationships than in initial investigations. Examines studies conducted by Utah State University's Early Intervention Research Institute in the…

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…

Advocates research on the effectiveness of early intervention programs for disabled children based on scientific method, rather than advocacy of positions. Reviews effective intervention practices. Illustrates use of the biosocial systems research model, examining biological traits in the context of social systems. Discusses benefits of this…

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)