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Originally Posted by Alcea Rosea

I agree with this. In fact, I have been wondering the type of one introvert in the family for many years now. He is ISTP, ISTJ or INTJ. He is very unlikely INTP and very unlikely any F type. There is a huge difference between Ti, Si and Ni but I really cannot see his primary function. The secondary functions (Se, Te, Te) don't help either. Secondary is rather Te than Se but I still cannot see it. I have ruled other personality types mostly out of the picture. Introverted people can be soooooo difficult to understand.

I like this thought Alcea, which goes along with my thoughts that contrary to theory the functions are not that easy to determine. As for the ISTP-ITJ family member, Berens says that Ni/Ti, and Se/Te are look-a-like functions. In my earlier thread, I was alluding to Berens' interaction style. Since all fore types mentioned are of that style, the reason for the extraverted appearance may lie with it.