Type Pages: Your Four Letters Against Your Behavior

A four-letter type is the most successful piece of vocabulary psychology has ever produced. It is memorable, it fits in a bio, and it gives people a way to talk about differences that a percentile score never will. That is a real achievement and it is not what this page is going to argue with.

What a type cannot do is tell you whether it is right about you. Every four-letter instrument works by asking you to report on yourself, then sorting those reports into categories. If your self-image is off in some specific way — and everyone's is — the result inherits the error and hands it back with more confidence than it arrived with. There is no step anywhere in that loop where anything outside your own account of yourself gets consulted.

That is the gap these pages sit in. Most type descriptions contain at least one claim about behavior: that you are decisive under uncertainty, that you are comfortable with risk, that you stay calm when something goes wrong. Those are not preferences, they are predictions, and a behavior task can check them. The balloon task on this site takes about three minutes and records what you did when a loss was immediate and the odds were hidden from you.

The two agree less often than people expect. Where they agree, you have something better than a type: you have a label with evidence behind it. Where they disagree, you have the more interesting result — a specific, located place where the story you tell about yourself and the record of what you did come apart. Neither outcome is available from a questionnaire alone, however long it is.