For WASI, see Wechsler Abbreviated Scale of Intelligence. IQ test designed to measure intelligence and cognitive ability in adults and older adolescents. The WAIS is founded on Wechsler’s definition of intelligence, which he defined as ” the global capacity of a person to act purposefully, to think rationally, and to deal effectively with his environment. He believed that intelligence was made up of specific elements that could development graphomotor skills in children of preschool age isolated, defined, and subsequently measured.
This theory differed greatly from the Binet scale which, in Wechsler’s day, was generally considered the supreme authority with regard to intelligence testing. These include things such as lack of confidence, fear of failure, attitudes, etc. Wechsler did not agree with the idea of a single score that the Binet test gave. Wechsler argued that the Binet scale items were not valid for adult test-takers because the items were chosen specifically for use with children. The “Binet scale’s emphasis on speed, with timed tasks scattered throughout the scale, tended to unduly handicap older adults. Wechsler believed that “mental age norms clearly did not apply to adults.
Wechsler criticized the then existing Binet scale because “it did not consider that intellectual performance could deteriorate as a person grew older. Wechsler argued for, have become standards in psychological testing, including the point-scale concept and the performance-scale concept. Each of these age levels was composed of a group of tasks that could be passed by two-thirds to three-quarters of the individuals in that level. This meant that items were not arranged according to content. Additionally, an individual taking a Binet test would only receive credit if a certain number of the tasks were completed. The point scale concept significantly changed the way testing was done by assigning credits or points to each item.
First, this allowed items to be grouped according to content. Second, participants were able to receive a set number of points or credits for each item passed. The non-verbal performance scale was also a critical difference from the Binet scale. Since the “early Binet scale had been persistently and consistently criticized for its emphasis on language and verbal skills,” Wechsler made an entire scale that allowed the measurement of nonverbal intelligence. This became known as a performance scale. This section needs expansion with: WAIS vs. You can help by adding to it.
The WAIS-R, a revised form of the WAIS, was released in 1981 and consisted of six verbal and five performance subtests. The verbal tests were: Information, Comprehension, Arithmetic, Digit Span, Similarities, and Vocabulary. The Performance subtests were: Picture Arrangement, Picture Completion, Block Design, Object Assembly, and Digit Symbol. A verbal IQ, performance IQ and full scale IQ were obtained. This section does not cite any sources.