Because of the difficulties he analyzed in a testtaker's response to a task, he called for more complex measurements of intellectual ability than previously undertaken.

Wechsler built upon these views, compiling a more complete definition of intelligence but as parochial as that examined by Sternberg. "Intelligence, operationally defined, is the aggregate or global capacity of the individually to act purposefully, to think rationally, and to deal with his environment." (235)

Wechsler critically added that intelligence is not just the sum of the abilities included in the definition, but it is something only understandable by the measurement of the various aspects of those abilities. (235) Likewise, he added that an individual's ability to perceive and respond to social, moral, and aesthetic values contributed to a personality of intelligence.

Examining the cognitive process of young children, Piaget found that intelligence was an evolving process of a certain adaptation to the outside world....
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