Here's a short overview of the differing opinions.

Their evaluation of the SAT's relation to the IQ test, its ability to predict success in school and the debate over whether the SAT measures "aptitude" or "achievement."

He is a Yale University professor of psychology and education and researcher of human intelligence. In his book Successful Intelligence: How Practical and Creative Intelligence Determine Success in Life, he argues for broadening the definition of intelligence and creating new tools to measure it.

Here's some analysis from the experts.

An index of data on the booming test prep business in the U.S.