The impact of group psychotherapy on social development in children with pervasive developmental disorders.

Thirty-nine children with a diagnosed pervasive developmental disorder (PDD) participated in homogeneous psychotherapy groups. Their social development was assessed at home and at school both before and after treatment. Significant improvements in social functioning were observed in both settings, and these gains were not attributable to demographic variables or cognitive development. This research provides psychometric validation for the Vineland Adaptive Behavior Scale (VABS; Sparrow, Balla, & Cicchetti, 1984) and the Tyminski Social Skills Checklist (SSC), a new index designed to assess children's social functioning in educational settings. The results suggest that group therapy may be an important modality for better understanding and developing crucial social skills among the growing number of children diagnosed with a pervasive developmental disorder.