To evaluate whether a structured social skills program, called Social Skills Development,is superior to a wait list control group on measures of interpersonal interaction. The Social Skills Development (SSD) is a 16-week, group intervention that uses activities and peer tutors to promote interpersonal skills in children 8 to 11 years of age with Autism Spectrum Disorders.Following a diagnostic and social skills assessment,children are randomly assigned to SSD or wait list for 16 weeks. Children who were randomized to the wait list are offered SSD at Week 16. Children randomized to SSD are followed for 9 months to assess the durability of gains during the first 16 weeks.