The medieval Islamic physician Ibn Sina noticed that students who could recite anatomy perfectly still froze when facing an actual patient — and he traced the failure not to missing knowledge, but to what he called 'estimative faculty' gone uncalibrated: the inner capacity that bridges abstract principle and live situation. Product managers face an identical gap. You can articulate your north star metric, your prioritization framework, your user segments — and still make the wrong call in the room, because the frameworks were built from past situations and the present one is slightly, critically different. Ibn Sina's fix was clinical exposure before theoretical mastery, not the reverse: force the estimative faculty to grapple with raw, ambiguous cases so it develops texture, not just vocabulary. The practical move is to periodically pull out a decision you made last quarter using a clear framework and reconstruct what you actually weighed in the room — the things that didn't fit the model, the discomfort you overrode. That's where the gap between your stated process and your live judgment lives.

Take one product call you made in the last two weeks. What did you actually weigh that your framework has no category for?

Drawing from Islamic Peripatetic Philosophy (Avicennian psychology) — Ibn Sina (Avicenna) — Canon of Medicine / Al-Qānūn fī al-Ṭibb, c. 1025 CE; also De Anima section of Kitāb al-Shifāʾ, c. 1027 CE