@kouhai The systems do differ in perspective so you are correct about them being not comparable although they are trying to quantify the same observations. MBTI seems to take a third-person perspective; what does type look like from the outside. Socionics seems to take a motivational approach; what internal classifications cause types to do the things they do. Socionics descriptions lack proper observer perspectives while MBTI really doesn't come close to addressing information processing. Both perspectives talk of function but neither really define it properly so the models aren't that enlightening. It's somewhat like developing atomic theory when everyone is still trying to redefine air. water, earth, and fire.........

a.k.a. I/O