I suspect if the two ladies had applied a bit more of a mathematical basis to thier hypothesis it would have gained greater acceptance. wieghing each attribute. and ten using set theory to sepatate. I would so you could compared combine each type with a mini IQ style test to do comparisons between individuals. and then compare use theses differences to measure differences between groups. Would give a way to compare artists to engineers. would also fix the flaws in the overly generalized IQ test.