Is the MBTI scientifically valid?

Partly, and the honest answer depends on which claim you mean. Its items do measure something real — four of its scales correlate substantially with four Big Five traits. What does not hold up is the type claim: that people fall into sixteen discrete categories, and that the resulting label is a stable property of a person. Scores on its dimensions are continuous and pile up in the middle, so the letters are a rounding of a gradient, and a large minority of takers get a different type on retest. Treat the dimensions as informative and the four-letter label as a summary that loses information.

Why do employers still use the MBTI if the Big Five is better?

Because they are used for different things. The MBTI is pleasant to receive — no type is bad, every description is flattering — which makes it workable in a room full of colleagues in a way that a report saying someone scores high on neuroticism is not. It also arrives with a large training and facilitation industry. That makes it a reasonable icebreaker and a poor selection tool, and its own publisher states it should not be used for hiring. For prediction of job performance, conscientiousness from a Big Five measure is the better-supported choice.

Which test should I take first?

The Big Five, if you only take one. It gives you five numbers you can compare against yourself later, it includes emotional reactivity, and it is the framework almost all published personality research uses, so anything you read afterwards will be expressed in its terms. Take the MBTI afterwards if you are curious how the same information looks as a type, or because your workplace uses the vocabulary — just read the letters as approximations of where you sit on four gradients.

Do Big Five scores change over time?

Yes, gradually and in a fairly consistent direction. Large longitudinal samples show conscientiousness and agreeableness rising through adulthood while neuroticism declines — a pattern sometimes called the maturity principle. The changes are slow and cumulative rather than sudden, so a retest a few weeks apart should produce close to the same scores, and a large jump usually reflects your state on the day, such as current stress or mood, more than a shift in disposition.

← All guides

Big Five vs MBTI: Which One Actually Predicts Anything?

One was derived from how people actually describe each other. The other was designed from a theory and sorts you into sixteen boxes.

The short answer

If you want a measure that predicts real outcomes and holds up on retest, use the Big Five. It is the model academic psychology settled on, it scores five continuous traits rather than assigning a type, and it has documented relationships with job performance, relationship stability, health behavior and income. The MBTI is more enjoyable to read and far more common in workplaces, but its four-letter type comes from cutting continuous scores at the middle, which is why a substantial share of people get a different type when they retake it weeks later. The MBTI is useful as shared vocabulary for a team conversation. It is not a measurement instrument, and it should not be used for hiring or selection.

Where each model came from

The Big Five was not designed. It was found, twice, by different groups looking for structure in language. Researchers took the thousands of English adjectives people use to describe personality and examined which ones cluster together in ratings, and five factors kept emerging — openness, conscientiousness, extraversion, agreeableness and neuroticism. The same five recur across dozens of languages and cultures. Nobody decided there should be five; five is what the data kept producing.

The MBTI was built the other way round. Katharine Briggs and Isabel Briggs Myers developed it from Carl Jung's theory of psychological types, starting in the 1940s, with the aim of making Jung's ideas usable for career guidance. The four dichotomies come from Jung's framework rather than from an analysis of how traits distribute in a population, and the instrument was constructed to sort people into the categories the theory proposed.

That difference in origin explains most of what follows. A model derived from observed variation describes gradations because that is what the variation looks like. A model derived from a theory of types produces types because it was told to.

The type problem: middles get rounded off

The four MBTI letters are produced by splitting each dimension at a cut point. The trouble is that the underlying scores are not bimodal — they pile up in the middle, like height. Most people are somewhere between clearly extraverted and clearly introverted, and for them the letter assigned depends on which side of the line they land, which can be a couple of items' worth of difference.

This is why retest instability is the MBTI's most-cited weakness. Studies re-administering it after several weeks find a large minority of people change at least one letter, and the changers are concentrated near the cut points, exactly as splitting a normal distribution predicts. Nothing about the person changed; the rounding did.

It also creates a real interpretive error. Two people labelled INTJ can sit at opposite ends of a dimension from each other, while an INTJ and an INTP scoring one item apart get descriptions that read as different kinds of person. The Big Five avoids this by keeping the score: 'moderately extraverted' is a report you can act on, and it stays the same report if you drift slightly on retest.

What the two actually measure in common

The MBTI is not measuring nothing. When both are given to the same people, four of the five Big Five traits map onto the four MBTI dichotomies reasonably well: extraversion–introversion tracks extraversion, sensing–intuition tracks openness, thinking–feeling tracks agreeableness, and judging–perceiving tracks conscientiousness. The correlations are substantial. In content terms the MBTI is largely a categorical rendering of four of the five factors.

The interesting part is the trait it has no equivalent for: neuroticism, the disposition toward anxiety, low mood and stress reactivity. This is not an oversight but a design choice — the MBTI was intended to describe preferences without implying anything was wrong, so a dimension where one end is a vulnerability had no place in it. It is also the single most predictive trait in the set for mental health outcomes, relationship satisfaction and burnout. Leaving it out is what makes every MBTI type description flattering, and it is the main reason the profile feels pleasant and predicts comparatively little.

Side by side

Big Five compared with MBTI
Aspect	Big Five	MBTI
Output	Five scores, each a position on a continuum.	One of sixteen four-letter types.
Origin	Derived empirically from how people describe personality, across many languages.	Derived from Jung's theory of types, then built into a questionnaire.
Retest stability	High. Scores move gradually, mostly with age.	Weak at the letter level — a large minority change a letter within weeks.
Covers emotional reactivity	Yes — neuroticism, the most predictive trait for wellbeing outcomes.	No equivalent dimension, by design.
Appropriate use	Research, self-understanding, and as one input among several.	Shared language for team discussion. Not selection or hiring.

Common questions

Is the MBTI scientifically valid?: Partly, and the honest answer depends on which claim you mean. Its items do measure something real — four of its scales correlate substantially with four Big Five traits. What does not hold up is the type claim: that people fall into sixteen discrete categories, and that the resulting label is a stable property of a person. Scores on its dimensions are continuous and pile up in the middle, so the letters are a rounding of a gradient, and a large minority of takers get a different type on retest. Treat the dimensions as informative and the four-letter label as a summary that loses information.
Why do employers still use the MBTI if the Big Five is better?: Because they are used for different things. The MBTI is pleasant to receive — no type is bad, every description is flattering — which makes it workable in a room full of colleagues in a way that a report saying someone scores high on neuroticism is not. It also arrives with a large training and facilitation industry. That makes it a reasonable icebreaker and a poor selection tool, and its own publisher states it should not be used for hiring. For prediction of job performance, conscientiousness from a Big Five measure is the better-supported choice.
Which test should I take first?: The Big Five, if you only take one. It gives you five numbers you can compare against yourself later, it includes emotional reactivity, and it is the framework almost all published personality research uses, so anything you read afterwards will be expressed in its terms. Take the MBTI afterwards if you are curious how the same information looks as a type, or because your workplace uses the vocabulary — just read the letters as approximations of where you sit on four gradients.
Do Big Five scores change over time?: Yes, gradually and in a fairly consistent direction. Large longitudinal samples show conscientiousness and agreeableness rising through adulthood while neuroticism declines — a pattern sometimes called the maturity principle. The changes are slow and cumulative rather than sudden, so a retest a few weeks apart should produce close to the same scores, and a large jump usually reflects your state on the day, such as current stress or mood, more than a shift in disposition.

Measure it on yourself

Reading about a trait and seeing your own score are different things. These assessments cover what this article describes.

Big Five Personality Test (OCEAN) — Free, 44 Items

The most validated model in personality psychology, rewritten as real-life scenarios. Measures Openness, Conscientiousness, Extraversion, Agreeableness, and Neuroticism.

44 items · 10 min · 5 sub-scales

Introvert or Extrovert Test — Your Social Battery

Where does your social energy come from and what drains it? Separates how quickly you deplete from what kind of contact restores you and from the depth you prefer.

18 items · 4 min · 3 sub-scales

Work Style Test — Planning, Focus and Collaboration

Separates how much you plan from how deeply you can focus and from whether thinking happens best alone or out loud with someone. Three things usually collapsed into one word: productive.

15 items · 3 min · 3 sub-scales

If you have a four-letter type

Each page states what the code claims about you, then the behaviour that would show it — the ones below are where the argument in this article bites hardest.

INFJThe Advocate INFPThe Idealist INTJThe Strategist INTPThe Analyst

All sixteen type pages, with the assessments that measure each letter on a gradient rather than as a side of a line.

Sources

John, O. P., & Srivastava, S. (1999). The Big Five trait taxonomy: History, measurement, and theoretical perspectives. In Handbook of Personality.
McCrae, R. R., & Costa, P. T. (1989). Reinterpreting the Myers-Briggs Type Indicator from the perspective of the five-factor model. Journal of Personality, 57(1).
Pittenger, D. J. (2005). Cautionary comments regarding the Myers-Briggs Type Indicator. Consulting Psychology Journal, 57(3).
Roberts, B. W., Walton, K. E., & Viechtbauer, W. (2006). Patterns of mean-level change in personality traits across the life course. Psychological Bulletin, 132(1).

Last reviewed 2026-08-07. This article is general information about psychological measurement, not medical or psychological advice.