An iq of a 100 shows that you are average in certain aspects of intelligence than most people. Personality tests test the non cognitive aspects of your personality like interests and values. Projective tests like the rorschach assess mental and emotional problems. Holton tried to show that intelligence was hereditary/environment. Bine"s test wanted to test the intelligence of school children. He quantified student"s performances: he tested many children of many ages; a norm was determined for each age , other kids were then tested against the norm to determine their intelligence level. Statistics showed that blacks and immigrants were inferior. Lewis turman adapted bine"s test for american school children, which led to the introduction of the iq; which was mental age/ chronological age x 100 = iq. Wexler developed non-verbal sections of the test so that language wasn"t a barrier. This was small children and immigrants could also be tested.