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Weschler Adult Intelligence Scale Fourth Edition (WAIS-IV)

Used as a general test the intelligence, the Wechsler Adult Intelligence Scale –Fourth Edition (WAIS-IV) was developed to assess cognitive ability for adults. This instruments aids in examining the relationship between intellectual functional and memory. A common purpose for the WAIS is for educational planning and placement with older adolescents and adults.
The test includes 11 subtests with various types of format. Approximately 60 to 90 minutes is required for completion.


David Wechsler

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.