Book excerpt: This leading course text and practitioner reference has been extensively revised with 90% new content, covering a broader range of child and adolescent problems in more concise chapters. Prominent authorities provide a comprehensive framework for evidence-based assessment. Presented are methods and tools for developing effective diagnoses and case formulations, building strong treatment plans, monitoring progress, and documenting outcomes. Chapters are packed with practical guidance, handy tables, and sample instruments. Illustrative case material is included. Prior edition title: Assessment of Childhood Disorders, Fourth Edition, edited by Eric J. Mash and Russell A. Barkley. New to This Edition *Many new authors and topics, reflecting over a decade of research and clinical advances. *Updated for DSM-5 and ICD-11. *Chapters on additional disorders: obsessive–compulsive disorder, persistent complex bereavement, and body dysmorphic disorder. *Chapters on transdiagnostic concerns: sleep problems, risky behaviors, and life stressors. *Four chapters on the "whys" and "hows" of using assessment in each phase of treatment. *Disorder-specific "starter kits"--lists of essential checklists, rating scales, interviews, and progress measures, including links to exemplary free measures online. See also the editors' Treatment of Disorders in Childhood and Adolescence, Fourth Edition.