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Originally Posted by The_Liquid_Laser

When I read about interaction styles it seems like four types seem to fit their descriptions best: INTJ, ENTJ, ENFP, INFP.

I can’t argue those that you have chosen although I equally think that ESTJ, ESFP and ISFP can equally represent their respective interaction styles.

Originally Posted by The_Liquid_Laser

Also there are four types that make me scratch my head and wonder why they got grouped that way: ISTP, ESTP, ESFJ, ISFJ. I'm not saying that the designation is wrong though. It's just that when I look at the four types INTJ, ISTJ, INFJ, and ISTP, it seems like the ISTP type as a whole doesn't share as much in common as the other three do.

I think it goes back to Berens’ being a student of Keirsey, so she based her interaction styles on his theory. This only reminds us that MBTI and temperament no more correlate perfectly than MBTI and the enneagram or any other system.

I have come to appreciate MBTI as a workable theory based on Jung and Berens’ work as a practical application to Keirsey. So to respond to your confusion, I actually see STPs being in the appropriate place of their respective interaction styles as are the SFJs. I have argued for years since becoming aware of Berens work that I may share a great deal with INTPs in just thinking and discussing theories, but when it comes to real world situations and actually taking some course of action, I have more in common with INTJ.