I'm an INTP, but I was wondering if someone with a higher knowledge of MBTI could help me with someone else's type, because it's been causing both of us a bit of grief.
My friend tested INFJ her first time, two years ago. And most of the time, she usually gets INFJ (although she's also tested INTJ on and off).
However, every time she reads an INFJ description, she never fully relates to every aspect of the description. More specifically, she doesn't relate to the Fe aspect of the INFJ description, because she doesn't really feel as though she "must" take care of others, or that she really cares to concern herself with others all that much. Mostly, she's more self-involved, although she is by no means cold, but more warm (she just comes off a bit more reserved and aloof at times, like she's hiding away, but not because she's mean).
So, she started questioning her true type, as anyone would, for perhaps she was mistyped, as tends to happen often. Thus, she started wondering if she was INFJ or INTJ (considering she tends to get INTJ a bit of the time). So she began taking more tests to ascertain her true type. Finally, to try to settle the matter, she took the MMDI, which shows the ordering of your cognitive functions and shows what types you are most likely to relate with.
The results were the following:
Ni > Fi > Te > Ti > Ne > Si > Fe > Se
On the test, she received INFJ (or perhaps INTJ). The difference between the two was 1%. However, if you really look at the ordering of these functions, those which are usually native to the INFJ (Fe, Ti, and Se) tend to be lower than those which are native to the INTJ (Fi and Te). And oddly, her Ne is somewhat developed.
Thus, it comes down to it. Based on the ordering of these functions, what conclusions can most reasonably be drawn? Is she—functionally—more INFJ or INTJ? Based on our research, we've come to think that she is an INTJ with a highly developed Fi, because her highest functions are Ni, Fi, and Te, with the INFJ functions being lower (Ti and Fe, although they are there).