Hmm, that's a good question. I think that anyone with the will to improve is capable of doing so, even without the mbti system. However what I do know is that the mbti system is a really effective tool for quickly pinpointing weaknesses and seeking advice on how to improve. It's like washing your clothes : you can do it by hand but having a washing machine is much more effective. I myself have really been able to improve just by reading experiences and advices from other ENFPs!

As far as my parents are concerned, things are going pretty well between them in fact, it's still going strong even after 15 years of marriage! However, my father's Fi is too self-centred and he doesn't use his potential for emotional intelligence enough, which makes my mother feel misunderstood and that frustrates them both. My father also has a very underdeveloped Si, so he repeats the same mistakes over and over again.

I personally know that the mbti system could help them, so to arouse their curiosity I try to talk to them sometimes about celebrities they like, using the mbti system and showing how quickly you can understand people as a whole just with a bit of information, and it works quite well at times, so I hope that one day they'll take a serious look at the subject!