Preschool Peer Social Intervention (PPSI) to Enhance Social Play, Interaction, and Conversation: Study Outcomes.

This RCT study examined efficacy of a preschool peer social intervention (PPSI) in facilitating social engagement of preschoolers with high-functioning ASD (HFASD; N = 65). HFASD participants were randomly assigned by preschool to a 6-month intervention (play, interaction, or conversation) or a waitlisted-treatment-as-usual control group. Trained on-site therapists led the PPSI in preschools, in small (n = 3-4) mixed (HFASD/typical) groups.