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Adult Cognition, Language and Neuropsychology -
General Abilities

Wechsler Abbreviated Scale of Intelligence (WASI)
David Wechsler, 1999

Overview: 
Obtain a reliable brief measure of intelligence

Age Range:
6 to 89 year olds

Administration:
Individual - Four Subtest Form = 30 minutes;
Two Subtest Form = 15 minutes

This newest addition to the Wechsler family meets the demand for a reliable, brief measure of intellectual ability in clinical, educational and research settings for ages 6 to 89 years. With parallel forms of WAIS-IIIUK and WISC-IIIUK subtests, it offers the clinician a means of reducing practice effects on repeat testing. 

The WASI provides you with more information than is typically available from other brief intelligence tests. This efficient assessment yields traditional verbal, performance and full scale IQ scores and is linked to the WISC-IIIUK and WAIS-IIIUK. This linkage allows you to estimate a range of full-scale IQ scores on the comprehensive batteries and increases the WASI's clinical utility. While the WASI is not intended to replace detailed assessment using the WISC-IIIUK and WAIS-IIIUK, it is the perfect instrument for quickly measuring an individual's general level of cognitive functioning. The WASI is unique because it allows you to choose whether to use the four or two subtest format. This flexibility provides you with control over administration time and depth of assessment. 

Ready for use in the United Kingdom

The link with the UK version of the WAIS-III is straightforward. UK norms for the WAIS-III are the same as in the US. Therefore, the relationship between the WASI and the WAIS-III will be equivalent in the UK. For the WISC-III, some minor differences were found in the younger ages for the UK sample in 1992 (i.e., UK children up to the age of 7 years scored slightly higher than their US peers). Therefore, although some caution is advised for children below the age of 7, overall, the relationship between the WASI and WISC-IIIUK will prove to be an invaluable in educational and clinical settings. 

You Choose Four- or Two-Subtest Format

WASI is unique because it allows you to choose whether to administer the four- or two-subtest format. This flexibility gives you control over administration time and depth of the assessment. The four-subtest form results in FSIQ, VIQ, and PIQ scores and can be administered in as little as 30 minutes. The PIQ score includes two different types of performance measures for richer information Matrix Reasoning, for measuring nonverbal fluid abilities and Block Design, for measuring visuomotor/coordination skills. The Vocabulary and Similarities subtests compose the Verbal Scale and yield the Verbal IQ, which is a measure of crystallised abilities. The two-subtest form provides an estimate of general intellectual ability and can be administered in about 15 minutes. This form includes Vocabulary and Matrix Reasoning. It provides only the FSIQ score. The four-subtest form can be administered in just 30 minutes, and the two-subtest form can be given in about 15 minutes. Matrix Reasoning provides a measure of nonverbal fluid abilities. 

Parallel Items Maximise Clinical Utility

All WASI items are new and parallel to their full Wechster counterparts. As in the full Wechsler battery, Block Design consists of a set of 13 modelled or printed two-dimensional geometric patterns that the examinee replicates within a specified time limit using two-colour cubes. The Matrix Reasoning subtest is similar to the WAIS-III Matrix Reasoning subtest (there is no counterpart in WISC-III); the Similarities subtest is parallel to the WISC-III and WAIS-III subtest but includes low-end picture items to extend the floor of the scale. Another new feature of Wechsler Abbreviated is the oral and visual presentation of words in the Vocabulary subtest. The Vocabulary subtest also has picture items that were designed to extend the floor of the test. 

Reliability Information

Average reliability coefficient: FSIQ-4 0.98, FSIQ-2 0.96
Test-retest reliability: FSIQ-4 0.92, FSIQ-2 0.88
Inter-rater reliability: 0.98 (Vocabulary), 0.99 (Similarities)

The Wechsler ability tests are restricted to Clinical Psychologists, Educational Psychologists and Psychologists with a relevant PhD. Other psychologists in training can have access to the tests only under the supervision of an appropriately qualified Psychologist. Under no circumstances should other professionals be given access to the Wechsler materials.


Available Products

Materials

Complete kit: Includes manual, stimulus booklet, 25 record forms, and set of 9 blocks in canvas bag
Additional copies of materials:
Manual
Record forms, pack of 25
Record forms, pack of 100
Stimulus booklet