The Integrated Play Groups Model (IPG) is an intervention designed to promote social development in children with autism while building relationships with typical peers. IPGs also may have positive effects on the unaffected children participating by increasing sensitivity and acceptance towards autism. In this study, the effectiveness of IPG in developing social skills in autistic children and in raising awareness of autism in typical peers will be evaluated. Dr. Wolfberg and colleagues will examine whether 30 autistic children participating in a 24-week IPG program show greater improvements in play, social, and communication behaviors than a control group who do not participate, and whether these improvements remain stable over time. Behavioral improvement will be evaluated by observation and parent ratings. As well, researchers will conduct clinical interviews with the non-autistic peer participants in the IPGs to examine changes in their understanding of autism and social inclusion of their autistic peers.