As part of this quest, I took the Myers Briggs. It's a personality test. Basically there are 16 different major types and everyone expresses Introversion/Extroversion, iNtuition/Sensing, Thinking/Feeling and Judging/Percieving in their own % of a whole. You end up with a 4 letter combo that expresses your basic personality default mode. Everyone expresses both sides, but one is stronger that the other. I always test ISFJ, but I am actually an INFJ. That sometimes happens when you score very close to the middle on one letter. Reading the descriptions and talking to someone who is an expert in Myers Briggs can usually clear up any confusion. I really love this test, and feel it explains a lot about me.