About the Wechsler-Bellevue Intelligence Scale
The Wechsler-Bellevue Intelligence Scale, published in 1939 by psychologist David Wechsler, was the direct predecessor to the WAIS and the first major adult intelligence test to use the deviation IQ and to combine verbal and performance subtests into a single composite scale.
By the late 1930s, David Wechsler at the Bellevue Psychiatric Hospital in New York saw two problems with the Stanford-Binet that dominated American intelligence testing. First, the mental-age formula (IQ = MA / CA × 100) broke down in adulthood - a 30-year-old with a mental age of 35 should logically have an IQ of 117, but in practice adult cognitive abilities stop growing around 16-20 and any further 'mental age' increase was an artifact of test difficulty rather than real growth. Second, single-score IQ obscured important profile information - a person could have very strong verbal abilities and very weak performance abilities, but the Stanford-Binet collapsed these into one number.
Wechsler's solution had two parts. First, replace mental-age IQ with deviation IQ: compare the subject's score to the distribution of scores in their own age group, with the mean fixed at 100 and SD at 15. This is the convention every modern IQ test now uses. Second, report separate Verbal IQ and Performance IQ scores in addition to a Full Scale IQ - giving clinicians a profile rather than a single number.
The Wechsler-Bellevue had 11 subtests (6 Verbal + 5 Performance) including direct descendants of Kohs Block Design (1923), the Healy Pictorial Completion (1914), Knox Cube (1914), and various Army Alpha/Beta items. Wechsler revised it in 1955 as the WAIS, and subsequent revisions (WAIS-R 1981, WAIS-III 1997, WAIS-IV 2008) have carried his framework forward. The current WAIS-IV is the most-used adult intelligence test in the world; it gets about 2-3 million annual administrations in clinical practice.
The 3 subtests
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Frequently asked questions
What is the Wechsler-Bellevue Intelligence Scale?
The Wechsler-Bellevue Intelligence Scale is an adult intelligence test published in 1939 by psychologist David Wechsler. It combined verbal subtests and performance (nonverbal) subtests into a single scale that produced a Verbal IQ, a Performance IQ, and a Full Scale IQ. It is regarded as the foundation of the modern Wechsler family of tests and the direct predecessor of the Wechsler Adult Intelligence Scale (WAIS).
Who created the Wechsler-Bellevue Intelligence Scale and why is it named that?
It was created by David Wechsler, a Romanian-born American clinical psychologist. He developed it while serving as chief psychologist at Bellevue Psychiatric Hospital in New York City, which is why the test carries the Bellevue name. Wechsler designed it for the adult patients he assessed there, since existing tests like the Stanford-Binet had been built mainly around children.
What made the Wechsler-Bellevue different from earlier IQ tests?
Two innovations set it apart. First, it introduced the deviation IQ, scoring a person against the average performance of others in the same age group rather than using the older mental-age-divided-by-chronological-age ratio formula. Second, it was the first widely used test to merge verbal subtests and performance subtests into one instrument, yielding separate Verbal and Performance scores plus a Full Scale IQ. This design let clinicians compare a person's language-based and nonverbal abilities directly.
How is the Wechsler-Bellevue scored?
The test uses the deviation IQ method. A person's raw scores are converted to standard scores and compared with the typical performance of others in their age band, with the average set at 100. Scores group into a Verbal IQ, a Performance IQ, and an overall Full Scale IQ. This age-referenced approach, rather than the mental-age ratio used by earlier tests, became the scoring standard for nearly all later intelligence tests.
What does the Wechsler-Bellevue measure?
It measures general adult intelligence through a battery of subtests divided into two domains. The verbal subtests assess areas such as general knowledge, comprehension, arithmetic, vocabulary, and reasoning with words and numbers. The performance subtests assess nonverbal abilities such as visual organization, pattern arrangement, and problem solving with blocks and pictures. Together these produce a profile of cognitive strengths and weaknesses rather than a single ability.
Is the Wechsler-Bellevue still used today, and is there a modern version?
The original 1939 Wechsler-Bellevue is no longer used in practice and is now of historical interest, since its norms are decades out of date. However, its design lives on directly: it was revised as Wechsler-Bellevue Form II in 1946 and then replaced in 1955 by the Wechsler Adult Intelligence Scale (WAIS), which has been updated through several editions to the current WAIS-5. The children's versions, the WISC and WPPSI, also descend from Wechsler's original framework.
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This page is part of the Historical IQ Tests Archive. Editorial content, transcription notes, and curation are released under Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0). Public-domain primary sources retain their public-domain status. BibTeX · RIS
Historical test materials are obsolete and are not valid modern IQ assessments. This page is preserved for educational, research, and historiographic purposes.
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The instrument documented above is a historical document. Modern IQ scoring uses contemporary norms (mean 100, SD 15). Our free full IQ test is available separately.