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cognitive science
Importance:

Heuristic

Also known as: heuristics, mental shortcut, rule of thumb

A mental rule of thumb that trades accuracy for speed — mostly right, fast, and nearly free, which is why the brain leans on them constantly.

Heuristic

A heuristic is a shortcut the mind uses to decide quickly without full analysis — good enough, most of the time, for a fraction of the effort. They’re a feature, not a flaw: you couldn’t function if every choice ran through deliberate reasoning. Biases are just the predictable places where the shortcut misfires.

I think about heuristics from both sides. Users navigate products almost entirely on them, so good design works with the shortcuts rather than against them — and knowing my own are running keeps me a little more honest in a high-stakes call.