 With funding from Autism Speaks 2007-10, the investigators have developed and conducted a pilot evaluation of an autism-specific intervention for toddlers with ASD. The Social ABCs, developed by the investigators, is an innovative parent-mediated intervention for toddlers with confirmed or suspected ASD. The Social ABCs draws on what is known about core, early emerging impairments in ASD, on evidence-based Pivotal Response Treatment PRT and associated parent training programs for enhancing development in children with ASD, and on the literature on effective parent training programs for at risk infants. The investigators also draw on their demonstrated success implementing a province-wide PRT-based early intervention program for preschoolers with ASD, and developing effective brief training in PRT for parents of newly diagnosed children with ASD. 