The research literature on intervention strategies for children with autism spectrum disorder (ASD) has mushroomed in the past 20 years. As the number of students diagnosed with ASD has grown, so has the number of professionals involved in developing and implementing effective treatment and educational practices. With this rapid expansion, it has become increasingly difficult to assimilate and utilize the varied range of strategies—encompassing behavioral, educational, ancillary or therapeutic. This volume provides a summary of these developments, including a historical review of the concept of autism as a diagnostic entity, and the lineage of the current best practice methodologies in assessment and intervention. The authors present concise and approachable information on the assessment and intervention of the characteristics of autism utilizing the science of applied behavior analysis.