The Wechsler Adult Intelligence Scale, Fourth Edition (WAIS-IV), is widely recognized as the gold standard for assessing adult cognitive functioning and intelligence. Released in 2008 by Pearson Clinical Assessment, it is an individually administered instrument designed for individuals aged 16 to 90 years. Structure of the WAIS-IV
Scoring and Standardization
Mean = 100, Standard Deviation = 15 (same as classic IQ metrics)
Scores are normalized by age (broken into 9 age bands from 16:0 to 90:11)
Index scores range from 45 to 155; FSIQ ranges from 40 to 160
Reliability coefficients exceed .90 for FSIQ and .80–.95 for index scores
Evaluates nonverbal reasoning, spatial processing, and fluid reasoning. Block Design, Matrix Reasoning, Visual Puzzles. Working Memory Index (WMI): Test Wais Iv
Verbal Comprehension Index (VCI) — verbal concept formation, reasoning with verbal material, general knowledge, and vocabulary.