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Originally Posted by Magic Poriferan

As a general point, consistency and symmetry are important. I hate the way Keirsey made the Temperaments based on different variables...

Any one of the possible permutations is better than Keirsey's system if you remain consistent. I have put a great deal of analysis into all of them, and they all have interesting, unique qualities. They could all be useful. I do try to avoid overlap, though. Hence -xx- and x--x. It would seem silly to me to combine -xx- with -x-x, as it is redundant on one, and leaves another out.

I was in agreement with that for years until I read Berens work on why he made the change. STPs have very little in common with SFJs and probably the same for SFPs and STJs. In fact if you think about it Ti/Fe or Te/Fi respectively are the the dominant and auxiliary functions for the eight types which are antagonistic.