This final report reviews activities and achievements of the "Let's Play!" project, an effort to apply assistive technology (AT) to promote the play skills of infants and toddlers with disabilities within their natural environments. The federally supported project was designed to assist county early intervention programs and developed, implemented, evaluated, and replicated a service model that focuses on the use of AT supports, loaned to families, to address family-stated play objectives on the Individualized Family Service Plan. During its 3 years of development and 2 years of replication, the project provided more than 2,300 AT/play services to over 400 families, replicated the model in nine New York county early intervention programs, and provided more than 60 training workshops. Unique features of the model include: (1) family direction; (2) the intervention focus on play; (3) selection of low-tech assistive technology; and (4) the lending library of toys and play adaptations. Individual sections of the report detail the project's goals and objectives, conceptual framework, model and participants, logistical problems, evaluation findings, impact, and future activities. Appendices include project forms and brochures, workshops and agendas, library inventory, and examples of promotion and dissemination projects. (Contains 53 references.) (DB)