The Myers-Briggs career test, honestly

The Myers-Briggs Type Indicator sorts people on four dichotomies — Introversion/Extraversion, Sensing/Intuition, Thinking/Feeling, Judging/Perceiving — producing sixteen four-letter types. It was developed by Katharine Cook Briggs and Isabel Briggs Myers from Jung's writing on psychological types.

MBTI and Myers-Briggs are trademarks of their owner. This site has no affiliation with them, does not administer the instrument, and is describing it from the outside.

The criticism is well documented and specific rather than general dismissal, and it matters most for exactly this application. Three points come up repeatedly in the literature. The traits it measures appear to be continuous rather than dichotomous, so cutting them into types puts people who scored nearly identically into different categories. Test-retest reliability is a known weakness — a meaningful share of people get a different type when they retake it weeks later. And its predictive validity for job performance or career satisfaction is weak.

None of that makes it useless as a vocabulary for talking about difference, which is largely why it persists in workplaces. It does make it a poor instrument for deciding what to do with your working life, which is the thing people most often reach for it to do.

The official MBTI is administered through a licensed practitioner and is not free. The tests returning a four-letter code in ninety seconds are unaffiliated lookalikes built on the same four axes.

That is not automatically a problem — some are thoughtfully built — but it does mean a type from a free site is not “your MBTI”, and any career list attached to it is the site's own invention rather than anything from the instrument.

Two things do more work. The first is interests, which have a better track record for predicting satisfaction than personality typing — the model for that is Holland's RIASEC, and there is a free government-published version of it.

The second is testing rather than typing. A shadow day, one informational conversation, or a small real project tells you more about whether you want a kind of work than any instrument will, because it produces evidence rather than a label.

The eighteen questions here are a preference inventory, not a personality test, and the difference is deliberate: the result is a location on a board with two neighbouring options named, not a four-letter identity. You also get the arithmetic behind it, so you can disagree with it.