circle-of-competencelisted

# Circle of Competence ## Overview Every decision-maker has a domain where judgments are reliable (inside the circle) and one where they are not (outside). The discipline: identify the boundary, act decisively inside it, refuse to act outside it without explicit acknowledgment of elevated uncertainty. Canonical source: Buffett (1996) — "The size of that circle is not very important; knowing its boundaries, however, is vital." Composes with [`dunning-kruger`](../dunning-kruger/SKILL.md) (cognitive mechanism the circle counters), [`metacognition`](../metacognition/SKILL.md) (self-monitoring the circle relies on), [`first-principles`](../first-principles/SKILL.md) (only reliable inside the circle), [`opportunity-cost`](../opportunity-cost/SKILL.md) (refusal has a real cost — measure it), [`probabilistic-thinking`](../probabilistic-thinking/SKILL.md) (calibration training establishes the boundary). ## When to Use - Evaluating an investment, acquisition, or partnership in an unfamiliar domain - Deciding whether to enter a new market or product area - A board member or investor is pushing you toward a domain outside your background - A founder is asked to take on a function (legal, finance, sales) without the relevant track record - Hiring senior roles in unfamiliar functions; allocating significant capital to a new business line **Not when:** decision is small, reversible, and an explicit learning bet; refusing everything outside the current circle is genuinely worse than a