Several successful social skills interventions for children with autism have been developed for use in school settings. Children who receive these interventions from a research team show marked improvements in friendships and playground behavior, but these gains usually fail to maintain because the school staff do not continue the intervention after the research study ends. In this study, we will modify one of these social skills interventions that was designed for skilled clinicians to use so that it can be used by school aides to improve the social involvement of children with ASD in schools. We then will test the intervention to see whether the intervention is as successful when aides deliver it. Training aides will increase children's opportunities to practice social skills with their peers at school and increase opportunities for generalization and maintenance of skills, since aides are so frequently present during social periods such as recess and lunch. If successful, this project will provide school districts with a cost-effective, easily implemented, and sustainable program that improves socialization in children with ASD within school settings. Once aides are trained, schools will have a built-in mechanism for continued success that will help many children with ASD and their families address the social challenges associated with ASD.