The Wide Range Achievement Test-Fourth Edition (WRAT4) is designed to provide "a quick, simple, psychometrically sound assessment of academic skills". The test was first published in 1946 by Joseph F. Jastak, with the purpose of augmenting the cognitive performance measures of the Wechsler-Bellevue Scales, developed by David Wechsler. Jastak believed that academic performance should also be considered during a cognitive assessment battery. The WRAT has since been widely used as a norm-referenced measure of basic academic skills--specifically in reading, spelling, and mathematical calculations. It has subsequently undergone several revisions, with the WRAT-Revised (WRAT-R) in 1978, the WRAT--Third Edition (WRAT3) in 1993, and the WRAT4 in 2006. Expanding on the earlier versions, new features of the WRAT4 include a Sentence Comprehension subtest and a reading composite score. Designed for use with individuals aged 5 through 94, the WRAT4 consists of four subtests--namely, Word Reading, Sentence Comprehension, Spelling, and Math Computation. This article presents a review of the test's reliability, validity, content validity, and concurrent validity.