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Retain auditory WM measures on WAIS, visuo-spatial WM Measures on WMS.

Revise digit span to emphasize WM (added Digit Sequencing).

Developed new subtest to measure fluid reasoning (Visual Puzzles and Figure Weights).

Fewer Subtests yield FSIQ and 4 Index Scores (VCI, PRI, WMI, & PSI).

Transitioned from dual IQ to Index Score structure.

Improved subtest and composite reliability.

Included new clinically sensitive supplemental subtests.

Simplified technical manual organization.

Revised instructions for clarity and consistency.

Reduced testing time by an average of 15%.

Reduced emphasis on motor demands and timed performance.

Reduced vocabulary-level for verbatim instructions.Added teaching items to ensure understanding of task.

Co-normed with the Wechsler Memory Scale®-IV.Click here for a listing of all special group studies. Increased developmental appropriateness.Enhanced scoring software to assist in generating customizable reports.Reduced administration time to obtain composite scores.Improved measures of Working Memory, Processing Speed, and Fluid Reasoning.Additional tasks for improved clinical utility.Updated normative data for ages 16-90 years.Responding to influencing factors: Changing Demographics In recognition of emerging demographic and clinical trends, the WAIS IV was developed to provide you with the most advanced measure of cognitive ability and results you can trust when addressing the changing clinical landscape.