The test was developed in the 1940s based on the untested theories of an outdated analytical psychologist named Carl Jung, and is now thoroughly disregarded by the psychology community. Even Jung warned that his personality “types” were just rough tendencies he’d observed, rather than strict classifications. Several analyses have shown the test is totally ineffective at predicting people’s success in various jobs, and that about half of the people who take it twice get different results each time.
With most traits, humans fall on different points along a spectrum. If you ask people whether they prefer to think or feel, or whether they prefer to judge or perceive, the majority will tell you a little of both. Jung himself admitted as much, noting that the binaries were useful ways of thinking about people, but writing that “there is no such thing as a pure extravert or a pure introvert. Such a man would be in the lunatic asylum.”
Some psychologists have now shifted from talking about personality traits to personality states — and why it’s extremely hard to find a real psychologist anywhere who uses the Myers-Briggs with patients.
There’s also another related problem with these limited choices: look at the charts and you’ll notice that words like “selfish,” “lazy,” or “mean” don’t appear anywhere. No matter what type you’re assigned, you get a flattering description of yourself as a “thinker,” “performer,” or “nurturer.”
This isn’t a test designed to accurately categorize people, but a test designed to make them feel happy after taking it. This is one of the reasons why it’s persisted for so many years in the corporate world, despite being disregarded by psychologists.
~ STFU INTP