Autism spectrum disorders (ASDs) are developmental disorders with similar features, including problems communicating, problems interacting socially, and the presence of routines or repetitive behaviors. These disorders can have a range of severities. They include autistic disorder, Asperger's syndrome, and pervasive developmental disorder not otherwise specified (PDD-NOS). In addition to their core impairment in social functioning, children and adolescents with ASDs often have anxiety about social interactions, which compounds their difficulties and can limit the benefits of treatment. This study will develop and test a treatment program for developing social skills and reducing anxiety in children and adolescents with ASDs.