The test includes 11 subtests with various types of format. Approximately 60 to 90 minutes is required for completion.
Reliability and Validity
The Wechsler Adult Intelligence is a well-established scale and it has fairly high consistency. Over a two to twelve week time period, the test-retest reliabilities ranged from 0.70 (7 subscales) to 0.90 (2 subscales). Interscorer coefficients were very high, all being above 0.90. According to the test manual, the instrument targets three are – psychoeducational disability, neuropsychiatic and organic dysfunction, and giftedness. The WAIS correlated highly with the Stanford-Binet IV test (0.88) and had high concordance with various measures: memory, language, dexterity, motor speed, attention, and cognitive ability.