This concise paperback summarizes basic and clinical sciences relevant to our understanding of attention-deficit/hyperactivity disorder (ADHD) with a particular emphasis on history, etiology, phenomenology, neurobiology, assessment, and treatment. Written by an internationally recognized clinician, researcher, and educator, the book ideally targets the learning needs of students, residents, and early-career practitioners, but also provides an updated overview with likely appeal for more experienced clinicians. The text is organized into succinct and well-referenced chapters. Critical information is easily discerned in accompanying key points, boxes, tables, and figures. References and suggestions for further reading are handy aids for readers who wish to obtain additional information on material described. Topics of special interest include assessment, approaches to initiating ADHD medications, controversies surrounding medication use, complementary and alternative treatments, and