The MBTI Manual as it stands, 3rd edition, revised 2003, printed 2009, and Isabel Myers Briggs Gifts Differing, revised 1995, take what was apparently Jung's view on the tertiary function, that it, just like the auxiliary and the inferior, is opposite in orientation to the dominant function!
So now I'm puzzled. See, I believe the more current understanding (which comes from where?--I don't know), that the functions alternate orientation as one moves down the order. And I assume this is a relatively new idea. I for one forget where I read it and why I accepted it other than that it seems true. But what in sweet jesus blessed name does this mean for the type descriptions? They're all based on Izzie's ideas!
Who developed the idea of alternating orientations? How long has it been around? Are MBTI practitioners really walking around using the old type dynamics model?