Abstract
The diagnosis of attention deficit hyperactivity disorder (ADHD) in adults has been a source of controversy, with some prominent researchers questioning its very existence and others suggesting it is an urgent clinical problem. This article reviews five domains of data addressing the validity of adult ADHD: clinical correlates, family history, treatment response, laboratory studies, and long-term outcome. It then shows how the debate over adult ADHD reflects a clash of theoretical paradigms and concludes by suggesting ways in which psychological science can collect the data needed to clarify the validity of adult ADHD.

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