Why the Smartest People Make Their Worst Decisions on Their Hardest Days
June 22, 2026
The circle of competence is not fixed. But it expands slowly.
Competence grows through structured learning, feedback, and repeated application. Not casual exposure.
Because deliberate learning requires sustained mental energy, maintaining decision clarity, something Numin is designed to support can help people expand competence without overreaching.
Before acting, ask:
If not, the right move may be learning or delegation.
The goal isn’t staying small. It’s expanding carefully, without pretending.
Warren Buffett describes the circle of competence as the limited set of domains you can evaluate accurately, emphasizing that knowing its boundaries is vital.
Abraham et al., deliberate practice and feedback quality in medical students, BMC Medical Education.
Studies on simulation training showing improved performance with repetitive practice plus expert feedback.
Ericsson 2019, Frontiers in Psychology (deliberate practice and its limits).