First, this allowed items to be grouped according to content. The point scale concept significantly changed the way testing was done by assigning credits or points to each item. This meant that falling short just one task required for the credit, resulted in no credit at all (for example, if passing three out of four tasks was required to receive credit, then passing two yielded no credit). Additionally, an individual taking a Binet test would only receive credit if a certain number of the tasks were completed. This meant that items were not arranged according to content. 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. In the Binet scales (prior to the 1986 version) items were grouped according to age level. included a non-verbal performance scale.used the point scale concept instead of the age scale, and.gathered tasks created for nonclinical purposes for administration as a 'clinical test battery',.

The WechslerвЂ“Bellevue tests were innovative in the 1930s because they: While this scale has been revised (resulting in the present day WAIS-IV), many of the original concepts Wechsler argued for, have become standards in psychological testing, including the point-scale concept and the performance-scale concept. However, the present-day WAIS-IV has contradicted many of these criticisms, by incorporating a single overall score, using multiple timed tasks, focusing on intellective items and other ways.

These criticisms of the 1937 Binet test helped produce the WechslerвЂ“Bellevue scale, released in 1939.

Wechsler criticized the then existing Binet scale because 'it did not consider that intellectual performance could deteriorate as a person grew older.'.

Wechsler believed that 'mental age norms clearly did not apply to adults.'.

The 'Binet scale's emphasis on speed, with timed tasks scattered throughout the scale, tended to unduly handicap older adults.'.

Wechsler argued that the Binet scale items were not valid for adult test-takers because the items were chosen specifically for use with children.

Wechsler did not agree with the idea of a single score that the Binet test gave.

These include things such as lack of confidence, fear of failure, attitudes, etc.).

Wechsler was a very influential advocate for the concept of non-intellective factors, and he felt that the 1937 Binet scale did not do a good job of incorporating these factors into the scale (non-intellective factors are variables that contribute to the overall score in intelligence, but are not made up of intelligence-related items.

A drastically revised new version of the Binet scale, released in 1937, received a great deal of criticism from David Wechsler (after whom the original WechslerвЂ“Bellevue Intelligence scale and the modern Wechsler Adult Intelligence Scale IV are named). This theory differed greatly from the Binet scale which, in Wechsler's day, was generally considered the supreme authority with regard to intelligence testing. His argument, in other words, is that general intelligence is composed of various specific and interrelated functions or elements that can be individually measured. However, these individual elements were not entirely independent, but were all interrelated. 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 be isolated, defined, and subsequently measured. The WAIS is founded on Wechsler's definition of intelligence, which he defined as '.

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