This chapter provides an overview of autism spectrum disorder (ASD) and intellectual developmental disabilities through the lens of applied behavior analysis (ABA). It begins by defining key neurodevelopmental disorders, including ASD and intellectual developmental disorder (IDD), and discusses prevalence and diagnostic criteria. Additionally, the chapter discusses common comorbidities and associated features of ASD, including genetic syndromes, sleep disturbances, and severe challenging behaviors. The chapter outlines the foundational principles of ABA, emphasizing the systematic application of behavior analysis to understand behaviors. This chapter also addresses the practical applications of ABA principles in supporting individuals with ASD and IDD, such as reinforcement, stimulus control, and generalization. Finally, it provides guidance on the educational and professional requirements for practitioners working in the field, stressing the importance of ethical practice, client rights, and neurodiversity.
Elsevier, Applied Behavior Analysis for Clinical, Educational, and Training Applications, 2026, pp 305-326
