Is the Myers-Briggs personality test meaningful?

There is a large body of research that suggests that the claims made about the MBTI cannot be supported. ... In this article I will review the basic research that questions the validity of the MBTI. ... I believe that MBTI attempts to force the complexities of human personality into an artificial and limiting classification scheme. The descriptions of each type are generally flattering and sufficiently vague so that most people will accept the statements as true of themselves [Barnum Effect].

I used to use [Myers-Briggs] as an icebreaker. People like taking it, and when you get the results back you feel good. But it has the intellectual content of a fortune cookie. There's no evidence that it predicts job performance or any meaningful non-test outcomes.

Perhaps no other personality test has achieved the cult status of the Myers-Briggs Type Indicator. ...the Myers-Briggs has also been embraced by a multitude of individuals who experience a revelation (what devotees call the "aha reaction") upon learning about psychological type. Their enthusiasm persists despite research showing that as many as three-quarters of test takers achieve a different personality type when tested again, and that [it has] no scientific basis whatsoever.

The people at CPP [who own the rights to MTBI] aren’t too concerned if the list doesn’t seem to match your type. They advise such persons to see the one who administered the test and ask for help in finding a more suitable list by changing a letter or two in your four-letter type. ... Furthermore, no matter what your preferences, your behavior will still sometimes indicate contrasting behavior. Thus, no behavior can ever be used to falsify the type, and any behavior can be used to verify it.