Wechsler Abbreviated Scale of Intelligence (WASI-II)

What is the Wechsler Abbreviated Scale of Intelligence (WASI-II)?

The Wechsler Abbreviated Scale of Intelligence (WASI-II) is a concise intelligence test developed by David Wechsler. Widely used for clinical assessments, research, and educational evaluations, WASI-II measures cognitive ability through four key subtests: Vocabulary, Similarities, Block Design, and Matrix Reasoning. These subtests contribute to calculating the Full Scale IQ (FSIQ) and the General Ability Index (GAI), providing insights into overall intellectual functioning. Stay updated on the latest information regarding the WASI-II for the most accurate details, and consult with professionals for comprehensive assessments.

Administration of WASI-II

There are 2 versions of WASI-II: a 4-subtest form and a 2-subtest form:

Ψ 4-subtest form: block design task, vocabulary task, matrix reasoning test and similarities test (approx. 30 minutes, completed in this order)
Ψ 2-subtest form: vocabulary and matrix reasoning test (approx. 15 minutes, completed in this order)

The block design task and matrix reasoning task form the Perceptual Reasoning Index (PRI), measuring nonverbal fluid abilities and visuomotor or co-ordination skills.

The vocabulary and similarities tests form the Verbal Intelligence Index (VCI), measuring the ability to use and apply learned knowledge and experience. The scores from all subsets are then combined to form a Full Score Intelligence Quotient (FSIQ) Score. 

What does WASI-II measure?

Due to the short testing duration, the WASI-II is useful when re-assessment is required after a comprehensive evaluation is done, or as a screening test to determine if in-depth evaluation is needed. This makes it a fast, reliable measure of intelligence when screening for intellectual disability or giftedness in children. It is also useful for spotting signs of Specific Learning Disorder, such as dyslexia and dysgraphia.

However, as the WASI-II is a rather brief test, it should not be used for legal, judicial or quasi-legal purposes. Therefore, we recommend taking this test alongside or as a complement to the WISC.