The fast system is built to leap. It turns partial evidence into a whole picture, then treats that picture as reality.
It works by taking what it has and making it coherent. What is missing gets filled in automatically, and contradictions get smoothed over.
A key rule is simple: what you see is all there is. You rely on what is in front of you and neglect what you do not know, even when the missing facts are decisive.
This is why confidence can be high in thin-data situations. Coherence feels like accuracy, and the mind rewards a clean story with certainty.
The slow system can ask for base rates and alternative explanations, but those questions require effort—and effort is what the mind tries to save.
If you want fewer errors, slow down at the exact moment certainty feels easiest—when a story forms too quickly to be questioned.