Over the past 25 years, we have learned a great deal about the diagnosis, treatment, and impact of autism spectrum disorders (ASD) on young children and their families. The authors describe several overarching themes that have emerged in the educational research on young children with ASD. The focus of their article is on education-based research because public education remains the one comprehensive service to which all children with ASD are entitled to free of charge. Four themes (i.e., inclusion, systematic and effective instruction, intensity, and social context) are described in terms of the major findings and impact on policy and practices. The authors conclude with a summary of implications for future research for the next 25 years.