The National Professional Development Center on Autism Spectrum Disorder (NPDC) is a national multi-site program that promotes the use of evidence-based practices (EBP) for: 1) early screening and diagnosis; 2) intervention and education; 3) intense, sustainable outcome-based training; 4) technical assistance and coaching for the delivery of effective services, for establishment of model sites, and for a sustainable system of training and TA; and 5) evaluation/measurement of child, practitioner, and system level outcomes.