Methodology

An honest account of where the framework stands and how we use it.

Our headline position

The 16-type framework is best understood as a vocabulary, not a verdict. It is genuinely useful for self-reflection, for giving people a shared language to talk about cognitive differences, and for surfacing patterns about how individuals tend to process information. It is not appropriate as a clinical instrument, a hiring screen, or a primary research tool — the Big Five (Five-Factor Model) is the framework with the stronger empirical record for those use cases.

We write from that middle position throughout. We will not oversell the test's validity. We will also not dismiss the cognitive-function model as worthless when it has, in our experience, given a lot of people genuinely useful framings.

What the research actually says

The most consistent critique of the MBTI in peer-reviewed psychological literature is that its test-retest reliability — particularly on the J/P dimension — falls below the standards expected of psychometric instruments. A meaningful percentage of people receive a different four-letter type on retest. Comparisons against the Big Five generally find that each of the four MBTI dichotomies correlates meaningfully with a Big Five trait, but the categorical sorting MBTI does on top of those continuous traits is not well-supported by the data.

The full treatment of this question is on the site.

Where we lean on cognitive functions

The cognitive-function model (dominant, auxiliary, tertiary, inferior) is more theoretically interesting and offers more specific, testable framings than the four-letter shorthand. It has not been validated to the standard the Big Five has been. We treat it as a useful interpretive lens, not as a proven theory. When the function-stack reading rings true to a reader, that's information. When it doesn't, the framework is wrong about them on that point — and we'd rather they leave with that than agree with everything.

What we won't claim

• We won't tell you your type with certainty. Tests don't, and neither will we.
• We won't claim public figures are a specific type. Type-by-proxy is an entertaining exercise and a terrible factual claim.
• We won't recommend MBTI as a hiring or screening tool. It isn't one.
• We won't pretend rare disagreements between reputable typology writers are settled. When they aren't, we say so.

How to use this site

Read the type that pulls you in. If it rings true, use it. If it doesn't, try the adjacent type in the same temperament group. If still nothing fits, the framework may not describe you well, and that's also useful information. Skepticism is welcome here — including skepticism of us.