This national multisite project will promote the use of evidence-based practices (EBP) for: (a) early screening and diagnosis of autism spectrum disorder (ASD); (b) intervention and education that result in optimal child and family outcomes and span the age range from infancy to early adulthood (22 years of age); (c) intense, sustainable, outcome-based training that leverages optimal use of existing resources; (d) technical assistance for the delivery of effective services, for establishment of model sites of EBP, and for a sustainable system of training and technical assistance; and (e) evaluation/measurement of child, practitioner, and system-levels outcomes. The project is a collaboration among the FPG Child Development Institute and other collaborators at the University of North Carolina, the Waisman Center at the University of Wisconsin-Madison, and the MIND Institute at the University of California at Davis Medical School. The project will work with States to provide training and technical assistance to increase the capacity of States to implement EBP, to increase the number of highly qualified personnel serving children with ASD, and to promote early identification of ASD. A tripart training model will be employed with each State. First, in the pretraining stage, State teams will conduct needs assessments and participate in a strategic planning process. In addition, State training staff will identify one local school district ready to participate as a model site for early intervention, preschool, elementary, and middle school/high school classes or programs. Second, training staff and practitioners will complete a prerequisite online training course. State training staff, practitioner participants, and representative family members will then participate in an intensive, one-week workshop. Third, after these trainings, project staff will conduct onsite consultation and planning with State sites to develop strategies and provide coaching to support the implementation of practices by local practitioners. States will participate in the program for two years, with the project staff taking the lead in training the first year and State-level personnel conducting intensive onsite training the second year. A primary objective will be for State agencies to employ this model for training, shaped to the needs and contexts of their individual State, with service providers in their State. Project staff will also collaborate with States to develop a State plan with identifiable benchmarks for building capacity for training, professional development, outcome-based measurement and evaluation, and service delivery for children and youth with ASD and their families.