The Social ABCs intervention was developed to meet the need for evidence-based, feasible, and sustainable interventions for toddlers with emerging ASD. Unlike other more comprehensive programs, the Social ABCs selectively targets only two key developmental areas (i.e., functional spoken language and positive affect). These domains were selected in order to promote developmental progress in areas thought to be central at this developmental stage in ASD. By targeting only two core domains, this program maximizes feasibility and portability (i.e., reduces resource demand) while effecting meaningful change with potential for collateral effects in untargeted, but related, areas.