 The Social ABCs is an innovative parent-mediated intervention for toddlers with confirmed or suspected Autism Spectrum Disorder ASD. The intervention draws on what is known about core, early emerging impairments in ASD, and on evidence-based Pivotal Response Treatment PRT and associated parent training programs for enhancing development in children with ASD. Completion of a comprehensive pilot study set the stage for a randomized control trial RCT of the Social ABCs. The purpose of this RCT is to evaluate the efficacy of the Social ABCs intervention program on improving spoken language skills and positive parent-child emotion sharing in toddlers with signs of or a diagnosis of ASD. 