Anyone who frequents MBTI forums sees people questioning their type and on occasion changing their type. Usually it's something simple, like INTJ to INFJ, or ISTJ to ESTJ. Simple, one-letter changes, as one gradually adjusts one's self understanding.
But what about the big changes? I've seen a few, with a brief summary of reasons.
INTJ to ENTP - better understanding of MBTI
ISFP to INTP - rather young in the first place
ENFJ to INTJ - optimistic person who went through difficult trials
What kind of type changes have you seen? And what do you think the reasons were?
How much is lack of understanding? How much is that one really hasn't faced a real trial in life? How much is it just that MBTI is a pseudo-science and cannot be used with precision?