The type code had another unintended effect, which was to elevate the E-I and the J-P dichotomies to the same level as the functions. I had always thought of myself as an Introvert and nothing else. I had also been taught that I was a Judging type and I had been told that “J’s decide quickly,” but that was not true for me. So there were holes in my preference framework where my experience did not fit what I was taught.
Jung considered all of the types that the MBTI® code identifies as I—J to be Perceiving types, and all I—Ps to be Judging types, because his use of the terms focuses on the dominant. Myers, however, focused on the extraverted function. So, are I—Js really ‘organized, scheduled, and decisive’ and I—Ps ‘spontaneous, casual, and flexible?’