Recent research by Gary L. Canivez and colleagues explored the construct validity of two widely used abbreviated intelligence tests: the Wechsler Abbreviated Scale of Intelligence (WASI) and the Wide Range Intelligence Test (WRIT). Published in School Psychology Quarterly, the study used data from 152 participants to examine the psychometric properties and structural validity of these instruments.
What are the WASI and WRIT tests?
The WASI and WRIT tests are tools designed for rapid assessment of general intelligence. While the WASI focuses on verbal and nonverbal abilities, based on subtests such as Vocabulary and Matrix Reasoning, the WRIT measures crystallized (verbal) and fluid (visual) abilities through subtests such as Verbal Analogies and Diamonds.
Both instruments have been widely used in clinical and educational settings for initial screening and periodic reassessments due to their time and cost efficiency.
Main results
The study identified significant correlations between the global scores of the two tests, indicating strong convergence between the measures of general intelligence (FSIQ in WASI and GIQ in WRIT). Confirmatory factor analyses reinforced a two-factor model, with the tests capturing both verbal-crystallized and nonverbal-visual-fluid dimensions, aligned with the Cattell-Horn-Carroll (CHC) hierarchical model of intelligence.
Furthermore, the analyses revealed that the general intelligence factor (g) contributed significantly to the observed variances, with less impact from the specific dimensions. This suggests that the interpretation of global scores may be more relevant than the detailed analysis of the subtests.
Practical implications
The results highlight the interchangeability of the WASI and WRIT tests in general intelligence assessments, especially in scenarios that require efficiency. However, limitations in sample size and diversity restrict the generalizability of the findings, and additional studies with larger and more heterogeneous populations are needed.
According to the authors, the choice between instruments must consider the context of the assessment and the specific needs of the professional administering the tests.
Reference
Canivez, GL, Watkins, MW, & Dombrowski, SC (nd). Construct validity of the Wechsler Abbreviated Scale of Intelligence and Wide Range Intelligence Test: Convergent and structural validity. School Psychology Quarterly.
