Examines various neurotypes including attention-deficit hyperactivity disorder, autism, and intellectual disability. Contrasts the neurodiversity framework with the medical model when serving neurodivergent clients. Discusses autism, including theories of causation, developmental aspects, descriptive and diagnostic characteristics, an overview of assessment and intervention, and legal and social issues. Reviews current research findings and best practices needed to gain a clear understanding of neurodivergent clients and how to apply current research to treatment.