Many studies (including our report) have investigated whether IQ predicts anything. The answer is that it does predict a bunch of things. But what does IQ actually measure? There are a surprisingly large number of proposed answers to this question. Below I list all the different theories and interpretations of IQ that I'm aware of. Theory 1: Multiple Intelligences IQ tests measure just a limited part of intelligence while missing (or at least mostly missing) other important parts of in...