IQ proponents have pointed out that IQ's predictive validity has been repeatedly demonstrated, for example in predicting important non-academic outcomes such as job performance, whereas the various multiple intelligence theories have little or no such support. Meanwhile, the relevance and even the existence of multiple intelligences have not been borne out when actually tested. Thus far, no one has been able to develop a set of ability tests that do not correlate together, and this refutes the claim that multiple intelligences are independent of each other.