The WAIS®–IVCDN includes a validity study with the new WMS–IVCDN as well as a linking study with the new WF:ASCDN to allow you to conduct ability-achievement discrepancy analysis. Validity and Linking Studies with the New WAIS®–IVCDN, WF:ASCDN, WIAT–II, and Upcoming WIAT–IIICDN In addition, the fourth edition now also includes adults with mild impairment and borderline intellectual functioning. The WAIS®–IVCDN clinical group studies include adults with clinical diagnoses of mental retardation, hearing impairment, reading disability, math disability, attention-deficit/ hyperactivity disorder, schizophrenia, traumatic brain injury, chronic alcohol abuse, Huntington's disease, Korsakoff's syndrome, Parkinson's disease, and Alzheimer's disease. New clinically sensitive supplemental subtests.Simplified technical manual organization.Reduced emphasis on motor demands and timed performance.Reduced vocabulary-level for verbatim instructions.Revised instructions as well as added demonstration and sample items to ensure clarity and proper understanding of tasks.Reduced administration time to effectively increase the diagnostic utility of the WAIS®–IVCDN.Increased Developmental Appropriateness and User Friendliness Improved Measure of Processing Speed–Reduced fine motor demands inclusion of additional supplemental subtest (Cancellation).Enhanced Measure of Working Memory–Revised Arithmetic subtest to emphasize Working Memory revised Digit Span subtest to emphasize Working Memory by adding a Digit Sequencing task retained auditory Working Memory measures.New Measure of Fluid Intelligence–New subtests measure fluid reasoning (Visual Puzzles and Figure Weights).Renamed Perceptual Organization Index (POI) as the Perceptual Reasoning Index (PRI).Transitioned from Dual IQ to Index Score Structure–Consistent with the WPPSI®–IIICDN and WISC®–IVCDN, fewer subtests yield FSIQ and 4 Index Scores (Verbal Comprehension, Perceptual Reasoning, Working Memory, Processing Speed).New optional index scores reflect current research and theory. It also has improved floors and ceilings to enhance its specificity in testing individuals with higher and lower cognitive functioning.
Besides updated norms, the WAIS®–IVCDN features improved subtest and composite reliability as well as reduced item bias.
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