This page has moved. Click here to view. The Wechsler I.Q. series is the most prominent psychological I.Q. test used in the United States.
Intelligence is a difficult thing to define.
If you ve got theorists on intelligence they would argue about a definition of it. I m not all that interested in a definition of intelligence except for how it informs, how the test can be used. That gives you a hint as to why we like to measure it. It has some relationship to adaptive function. So there are Wechsler I.Q. tests that cover the full range of humans, the full age range of humans from preschool up to age 89.