Attention-deficit/hyperactivity disorder (ADHD) is one of the most common mental disorders affecting children and adolescents. The core ADHD symptoms are pervasive and impairing inattention, hyperactivity, and/or impulsivity. Due to its significant prevalence during the lifespan and associated impairments, the disorder is considered a major health problem. Despite a substantial increase in clinical and research interest in ADHD in recent years, there is a relative lack of practical handbooks and handy reference texts on the assessment and management of patients with this condition. Part of the Oxford Psychiatry Library, this pocketbook provides a user-friendly introduction to the diagnosis, evaluation, and treatment of ADHD.