Wechsler Abbreviated Scale of Intelligence® - Second Edition
Age Range: Individuals 6:0–90:11
Completion Time: Four-subtest form, 30 minutes; Two-subtest form, 15 minutes
Scores/Interpretation: VCI, PRI, and FSIQ scores (FSIQ–4 and FSIQ–2)
Scoring Options: Manual scoring
Publication Date: 2011
The WASI–II, a revision of the WASI, provides a brief, reliable measure of cognitive ability for use in clinical, educational, and research settings. This revision maintains the format and structure of the WASI while offering new content and improvements to provide greater clinical utility and efficiency.
Uses & Applications
Psychologists and researchers can use this quick and reliable measure when screening for intellectual disabilities or intellectual giftedness, or for other purposes:
- Screen to determine if in-depth intellectual assessment is needed
- Reassess after a comprehensive evaluation
- Estimate a range of FSIQ scores on comprehensive batteries
- Assess cognitive functioning of individuals referred for psychiatric evaluations
- Measure IQ scores for vocational, rehabilitation, or research purposes
- Compare results to the Wechsler Family Fundamentals: Academic Skills to determine a student’s academic strengths and needs based on an ability-achievement discrepancy analysis
Content & Administration
The WASI–II builds on the strength of the WASI by providing updated versions of the WASI Vocabulary, Similarities, Block Design and Matrix Reasoning subtests, flexible administration options (i.e., four- or two-subtest versions), and strengthened connections with the WISC®–IV and WAIS®–IV.
The WASI-II subtests have been updated to provide a variety of improvements including shortened and streamlined instructions, better floors and ceilings, as well as item content that more closely mirrors that of the WISC–IV and the WAIS–IV.
Flexible Administration Options
The WASI–II provides flexible administration options. The four-subtest form can be administered in just 30 minutes and the two-subtest form can be given in about 15 minutes.
Strengthened Connections with the WISC–IV and WAIS–IV
The strengthened connections between the WASI–II and the comprehensive Wechsler intelligence scales result in a stronger empirical foundation for using the instruments together, and offer practical benefits that help you save time. The WASI–II subtests and items have been revised to more closely parallel their counterparts in the WISC–IV and WAIS–IV. Linking studies have been conducted with the WAIS–IV and the WISC–IV to establish equivalency and to improve comparability with the comprehensive Wechsler scales’ composite scores. Taken together, these improvements enhance the joint use of the WASI–II and the comprehensive scales.
The WASI–II can be used in conjunction with the comprehensive Wechsler scales as a screening instrument to determine if in-depth intellectual assessment is necessary, or as a reevaluation tool to follow up on comprehensive testing. If after screening, the WASI–II results indicate comprehensive intellectual assessment is needed, the WASI–II subtest scores can be substituted for the four corresponding subtest scores on the WISC–IV or WAIS–IV, which makes administration of those four subtests from the WISC–IV and WAIS–IV unnecessary. That is, after administering the WASI–II, administering only six more subtests (rather than ten) from the comprehensive measure allows you to derive all WISC–IV or WAIS–IV composite scores. If the WASI–II is used as a reevaluation tool, it provides comparable FSIQ, VCI, and PRI scores to ensure interpretation of change over time is clear and meaningful.
Features & Benefits
The WASI–II offers significant enhancements and retains features you’ve come to rely on:
- Updated normative sample representative of today’s population and closely matched to new U.S. Census targets
- Four- and two-subtest versions allow you to control the administration time and depth of assessment
- Parallel items and subtests and strengthened links to the WISC–IV and the WAIS–IV maximize clinical utility and efficiency in cognitive assessment practice
- Simplified administration and scoring provide even more efficiency
- Updated norms: The standardization of the WASI–II was conducted from January 2010 to May 2011 on a nationally representative sample of approximately 2,300 individuals aged 6–90.
- Improved floors and ceilings
- Ability-Achievement discrepancy analysis with the Wechsler Fundamentals: Academic Skills
- Linking studies with the WISC–IV and the WAIS–IV to:
- Provide prediction intervals from WASI–II FSIQ to the comprehensive FSIQ;
- Provide supporting data and guidelines for substituting WASI–II subtests for parallel subtests in the comprehensive scales.
Frequently asked questions follow. Click on a question to see the response.
I like the WASI. How is the WASI–II different?
- Updated normative sample: Norms are representative of today’s population and extend to 90:11.
- Simplified administration and scoring
- Shorter discontinue rules
- Reversal rules are more user-friendly and more consistent with comprehensive Wechsler intelligence scales
- Directions organized in a more streamlined fashion and reading instructions shortened by 40%
- Stimulus Book enhancements improve user-friendliness:
- Stimulus book now flips forward toward the examinee rather than backward toward you, making the pages easier to turn in situations where the testing surface is too wide
- Improved coil of the Stimulus Book makes pages easier to turn and binding more durable
- Closer parallels to WISC–IV and WAIS–IV:
- Across the four subtests, 20-40% of the WASI–II items are new or revised
- Composite score names now reflect updated and consistent terminology with WISC–IV and WAIS–IV. For example:
- VIQ (Verbal IQ) → VCI (Verbal Comprehension Index)
- PIQ (Performance IQ) → PRI (Perceptual Reasoning Index)
- Updated versions of WASI subtests
- Similarities subtest floor (easy items) improved with new picture item type; as well as updates to items with close attention to vocabulary level of words and content that reflects abstract concepts and reasoning.
- Matrix Reasoning subtest more similar to WISC–IV with realistic picture items
- Block Design subtest ceiling (hard items) stronger with new and innovative items
- Vocabulary subtest updated with new art as well as new ceiling items
How can I maximize my use of the WASI–II with the WISC–IV and the WAIS–IV?
Because the WASI–II is linked to both the WISC–IV and the WAIS–IV, and provides unique items and subtests that also parallel the comprehensive measures, there are opportunities to maximize the clinical utility of these tests while saving you and your clients time.
The WASI–II can be used either before or after the comprehensive measures for situations in which multiple evaluations must be conducted. Because the items are unique to the WASI–II, practice effects are avoided.
The WASI–II can also be used as a screening measure to determine if comprehensive intellectual assessment with WISC–IV or the WAIS–IV is necessary. WASI–II subtest scores can be substituted for the corresponding WISC–IV or WAIS–IV subtest scores because the WASI–II subtests are statistically equated to the corresponding WISC–IV and WAIS–IV subtests. More specifically, the WASI–II subtest T scores can be converted to scaled score units and used in comprehensive FSIQ derivation.