Improved floors/ceilings, improved subtest/composite reliability, and expanded FSIQ range.Improved measures of Working Memory, Processing Speed, and Fluid Reasoning.Transitioned from dual IQ to Index Score structure.Additional tasks for improved clinical utility, new clinical and validity studies.New subtests, including Visual Puzzles, Figure Weights, and Cancellation.Increased developmental appropriateness.Ī core battery of 10 unique subtests focuses on four specific domains of intelligence: verbal comprehension, perceptual reasoning, working memory, and processing speed.Reflects changing demographics, emerging clinical needs, new research, and increased caseloads.WAIS-IV was developed to provide the most advanced measure of cognitive ability and results when addressing the changing clinical landscape.
