From leading authorities, this state-of-the-art manual presents the Early Start Denver Model (ESDM), the first comprehensive, empirically tested intervention specifically designed for toddlers and preschoolers with autism spectrum disorder. Supported by the principles of developmental psychology and applied behavior analysis, ESDM's intensive teaching interventions are delivered within play-based, relationship-focused routines. The manual provides structured, hands-on strategies for working with very young children in individual and group settings to promote development in such key domains...