I am now really quite confused about this. I believed someone to be an INTJ but a friend suggested they were more ISTJ and upon further reading i think they may be. I could really use some help understanding how the two types differ from each other. I have read the descriptions of both but i'm still uncertain. I also read a thread of an ISTJ which sounded so much like this person it was a little scary. Maybe i should post some info about said mysterious untyped person? but i'm unsure what i should say about them to help type them, any ideas?