Children with or at risk of disabilities, however, often demonstrate delays in play skills, which deleteriously affect their engagement in classroom activities including social interactions with peers (Barton, 2010). The effects can be cumulative because playful interactions with caregivers, peers, and teachers are a primary context for learning new skills (Barton, 2014; Dunst, Hamby, Trivette, Raab, & Bruder, 2000), including social skills that can be used across typical classroom activities, materials, and settings (Schneider & Goldstein, 2008). The relation between social skills acquired through play and school readiness highlights a critical need to address play and social competence as early as possible (Lee & Bierman, 2015; Stormont, Herman, Reinke, King, & Owens, 2015). Social competence in children predicts important outcomes such as academic achievement, job retention, and relationship success (Christakis & Fowler, 2011; Jones, Greenberg, & Crowley, 2015). Effective interventions for addressing child social competence exist (Hemmeter, Snyder, Fox, & Algina, 2016) and primarily involve adult systematic prompting (Joseph, Strain, Olszewski, & Goldstein, 2016). The best outcomes have been associated with interventions in which adults intentionally plan and facilitate social interactions between typically developing children and children with disabilities (Odom & Strain, 1986). In fact, this type of peer-mediated instruction-when intentional and systematic-has been effective for teaching the broad range of discrete skills needed to positively affect the frequency and quality of peer-related social interactions (Odom et al., 1999; Strain & Bovey, 2015).