The practice of individual assessment has been moving toward the empirically derived Cattell-Horn-Carroll (CHC) theory of intellectual ability, which offers a hierarchical taxonomy of cognitive abilities. Current assessment tools provide varying adherence to operationalizing CHC theory, making clinical inference difficult. Expert consensus…

Examined the factor structure of the Wechsler Adult Intelligence Scale-Revised (WAIS-R) in a sample of 200 medical patients and 271 psychiatric patients. Results indicate the WAIS-R has a robust factor structure and provide evidence of Verbal, Performance, and Freedom From Distractability factors in psychiatric and medical populations. (Author/BH)

A study concluding that the Wechsler Adult Intelligence Scale (Revised) (WAIS-R) has three clear factors in its structure is critiqued. An alternative factor comparison technique, FACTOREP, is used with identical data. It is demonstrated that the WAIS-R has only two strong factors--verbal comprehension and perceptual organization. (TJH)