This article examines recent literature related to the diagnosis of Attention-deficit/Hyperactivity Disorder (AD/HD) in childhood. First, the article discusses diagnostic criteria presented in the "Diagnostic and Statistical Manual of Mental Disorders" (American Psychiatric Association, 2000). Next, it explores the diagnostic procedures for AD/HD recommended in current publications. Results of this comprehensive literature review indicate that rating scales, interviews, laboratory/psychological testing, and observations are the most frequently recommended AD/HD diagnostic techniques. The implications of these findings for school psychologists are discussed. (Contains 2 tables and 1 footnote.)