targets relationship development in order to remediate social isolation in adolescents with ASD. The developers of PEERS found that the treatment group increased in their knowledge of social skills, hosted and attended more get-togethers, and improved social skills immediately following the intervention per parent-report (Laugeson et al. 2009), and they also found that these gains maintained at long-term follow-up 1–5 years post-intervention (Mandelberg et al. 2014).