Despite decades of research and scientific study, ADHD, or attention deficit hyperactivity disorder, is still subject to a great degree of debate about its origins, causes and treatments. This guide for the non-specialist introduces students, parents and teachers to current opinions and controversies surrounding the disorder. From difficulties diagnosing ADHD to debates on treatment options, the 168 articles of this encyclopedia succinctly summarize current research and objectively present differing opinions where interpretations vary. Overview entries explore the causes and diagnosis of ADHD. Other articles examine the relationship of ADHD to autism, depression, dyslexia and conduct disorders. Associations of the disorder with creativity, genetics, hearing loss, and life expectancy are also investigated. From caffeine to Vitamin B, drug interactions and nutrition issues are carefully reviewed. Assessment methods and treatment options are explained. Selected articles describe the prevalence of symptoms by gender and age. Social costs, public awareness and legal issues are also discussed. Suggestions for further research include both print and online resources. In short, this handy guide will serve a wide audience in academic and public libraries.