I have a friend who is curious about his type, and is vacillating between ISFJ and ISTP as the 2 possible ones. I know they are unlikely to mix up, he just has a well developed feeling side and likes to see himself as responsible and trustworthy. He hardly knows about the MBTI, and doesnt have the time to really look into it, but he is a tad curious at to what he is.
He also comes off as more extraverted and likes people. I am sure he is IS.
I can provide more info. Suffice to say he likes to get work done, and works actively, but is very flexible and adaptable to changing things.
He has 2 sides to him. One minute he can seem very ISTP and then look like an ISFJ. Depending on the moment and how vulnerable and trusting he feels.
He also has a well developed feeling side to him. He can test as a F and as T,depends on the moment. He is people oriented and likes being in service and knowing he helped someone, but hes also very logical and is objective in decision making. What throws me off is he mentioned that he is a heart person, as well as a head person, and he could make decisions considering its effect on others, and he has strong feelings for people hes close to that he doesnt show easily. Hes also not outwardly critical and likes to please people. So I can see both.
Its prob obvious, just not to me. What are the defining dif between the 2, in behavior, like what one can have and not the other. Thank you!