APA Dictionary of Psychology

a standard assessment tool used to obtain a quick, accurate assessment of reading, spelling, and arithmetic skills. The most recent version, the Wide Range Achievement Test–Fourth Edition (WRAT–4), was published in 2006 for use with children, adolescents, and adults in determining skill deficits as well as appropriate levels of instruction; it can be one component in identifying a learning disability. The Wide Range Achievement Test–Expanded Edition (WRAT–Expanded), published in 2001, is designed to measure academic achievement in children and adolescents. [originally developed in 1936 by Polish-born U.S. psychologist Joseph F. Jastak (1901–1979)]