Now in a revised and expanded third edition, this Handbook presents the latest knowledge on the nature, diagnosis, assessment, and treatment of Attention-Deficit/Hyperactivity Disorder (ADHD). Provided are state-of-the-art guidelines for understanding and managing the challenges ADHD poses to children, adolescents, and adults in a range of settings. Featuring a new chapter on combined therapies, the third edition is the most comprehensive, authoritative, and up-to-date work in the field.