The Raggio Evaluation of Attention Deficit Disorder (READD) is an objective measure for the diagnosis and management of attention deficit disorder (ADD) in children. Extensive research has been conducted on its clinical and psychometric properties, as described in Chapter 3, "Development and Standardization." The READD is a microcomputer edition of the Continuous Performance Test (CPT), a test that has shown promise as a measure of attention, concentration, and impulsivity. Part of the success of READD in diagnosing ADD is related to the teaching of the task, which allows for unlimited teaching sequences. The clinical diagnosis is derived from the child's performance on the READD version of the CPT, with behavioral history from parents, rating scales from the teacher, and other psychoeducational testing. How to administer the READD is described, and its technical characteristics are outlined. Studies are cited that have supported the reliability and predictive validities of the READD. An appendix presents 24 tables of normative data. (Contains 22 references.) (SLD)