Toleration of ambiguity — the capacity to act well without resolving uncertainty — is what distinguishes senior leaders from merely competent ones. But here's what almost no mental model framework tells you: the bottleneck isn't information, it's the frame you're using to decide when you have enough. The American philosopher William James made a related argument in his 1897 essay 'The Will to Believe': he noticed that certain decisions cannot wait for complete evidence, and that refusing to act until certainty arrives is itself a choice — one that carries its own consequences. Combined with what cognitive psychologist Jerome Bruner called 'going beyond the information given,' this points to something precise about mental models: their hidden variable is not accuracy, but the threshold at which they trigger closure. The model that makes you feel certain fastest is the one most likely to be misapplied. The practical discipline: pick one significant decision you made in the last month and ask not 'was the model right?' but 'when did I stop looking?' That moment — the closure point — is the actual mental model, more than any diagram or framework you drew around it.

For a decision you made recently that still feels uncertain — at what point did you stop gathering input, and was that your choice or just the point where you got tired?

Drawing from American Pragmatism synthesized with Cognitive Psychology (Jerome Bruner) — William James (synthesized with Jerome Bruner)