"How? Is it like a pH test or voltage test or amp test or pregnency test? If we can not agree on the definition of Intelligence, how does the test help? can a person who is blind or deaf take the test? What does that measure?....." Ah thats right! We dip some paper in you and if it's red --- Genius! Blind or deaf people could take the test with some help.. Blind, deaf, mute, people who are completely numb could have some problems! The IQ (intelligence quotient) test measures your IQ: The ratio of tested mental age to chronological age, usually expressed as a quotient multiplied by 100. "Intelligence is ability to retain and analyze information." Sounds good to me. When we talk about intelligence I think it means pure ability to think. The test will not measure creativity, etc... Edit: I don't think creativity should be included as part of the definition of intelligence.