Quote Originally Posted by Andreas View Post
How about making a simple objective of scientific research, like about whether typing people based on four first-tier dichotomies of E/I, S/N, T/F, and j/p are a good parameter or not?
Those four dichotomies are enough to define a type in socionics, but not the intertype relationship structure, which is the basis of Model A. If you read the paper @thehotelambush wrote on group theory, he mentions this is a critical difference between the MBTI's four dichotomy approach and socionics. One reason the MBTI could be inaccurate is it is using a fundamentally wrong scheme.
https://www.dropbox.com/s/73jddzvuu8..._Ectsul68soyds

I'm not sure how many dichotomies we need for socionics. Five dichotomies are enough to generate its dihedral four cross cyclic two structure, but it might not be conceptually balanced unless you include more. Also, it might make more sense to use higher order objects like a cyclic four group, or a dihedral four group, but I don't know how you would test them.