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Every psychologists characterise and define intelligence in their own way. Alfred Binet was one of the first psychologists who worked on intelligence and defined intelligence as 'the ability to judge well, understood well and reason well.'
Wechsler intelligence test is widely used who understood intelligence in terms of functionality i.e. its value for adaptation to environment. He defined it as the global and aggregate capacity of an individual to think rationally, act purposefully, and to deal effectively with her/his environment.
Gardner and Sternberg have suggested that an intelligent individual not only adapts to the environment, but also actively modifies or shapes it.
Thus, intelligence have certain attributes like mentally alert and quick, sense of humour and understanding according to psychologists.