THE MEASUREMENT OF ADULT INTELLIGENCE Author:David Wechsler The full scale IQ test is broken down into 14 sub tests, comprising the verbal (seven sub tests) and performance scales (seven sub tests). — Wechsler's tests provide three scores: — 1. a verbal IQ (VIQ) — 2. a performance IQ (PIQ) — 3. a composite, single full-scale IQ score based on the combined scores. — WAIS-R was standardised in 1981 on a sample ... more »of 1,880 US subjects, ranging from 16 to 74 years of age, broken down into 9 different age groups. It is considered to have very strong reliability. The current version is WAIS-III. WAIS-IV is currently undergoing national standardization and slated for release in late 2008.
The median full-scale IQ is centered at 100, with a standard deviation of 15. In a normal distribution this IQ range is where approximately 68% of adults would fall.« less