"The Woodcock-Johnson IV Tests of Cognitive Abilities" (WJ IV COG) is an individually administered measure of psychometric intellectual abilities designed for ages 2 to 90+. The measure was published by Houghton Mifflin Harcourt-Riverside in 2014. Frederick Shrank, Kevin McGrew, and Nancy Mather are the authors. Richard Woodcock, the namesake and originator of the measure, is one of the true innovators and legends in psychoeducational assessment. The WJ IV COG includes some notable changes from its predecessor, the WJ III COG (Woodcock, McGrew, & Mather, 2001, 2007). The changes emerged from revision goals that involved maintaining rigorous psychometric qualities from previous versions, updating the test to represent recent research in the measurement model for the Cattell-Horn-Carroll theory of intelligence (CHC theory; Schneider, & McGrew, 2012), organizing the tests into three batteries (cognitive, oral language, and achievement), and improving ways to make comparisons among cognitive abilities within and among the three batteries. The reviewers concluded that the WJ IV COG is an excellent measure of psychometric intelligence. The theoretical basis of the test and transparency in test development described in the Technical Manual are exceptional. Similar to previous versions, the psychometric properties are top notch. It is relatively easy to administer (e.g., the test easel administration format), allowing for an examiner to efficiently obtain a trove of data about an individual's cognitive abilities. It has utility in helping to understand a person's intelligence, and scores from the WJ IV COG are particularly useful if used in conjunction with the co-normed WJ IV ACH and WJ IV OL.