Investment & Finance
ProCircle of Competence
能力圈 · Source: Warren Buffett / Charlie Munger
Honestly assessing your true depth of understanding in a domain before making a major commitment
Core Concept
Your circle of competence is the domain you truly understand — not what you think you understand, but where you can make precise judgments under pressure. Munger: "Knowing what you don't know is more useful than being brilliant." Act within your circle; be cautious or decline outside it.
✓ When to use this
Before investing, partnering, founding, or making cross-domain decisions. Honestly draw the boundary of "what I truly understand" — bet bigger inside, assume you will be wrong outside and either size down or buy outside expertise.
✗ When not to use this
Not for pure exploration and learning phases — deliberately stepping outside is how the circle expands. Also do not use this to rationalize over-conservatism; avoiding all unfamiliar things shrinks the circle.
Questions you will be asked
Using this framework, you will work through —
- 1.What domain does this decision require you to deeply understand?
- 2.How deep is your genuine understanding of this domain? Where did you acquire it?
- 3.Can you explain the most complex aspects of this domain in simple language? Try it.
- …and 3 more
Related Frameworks
Investment & Finance
Margin of Safety Thinking
Any decision resting on critical assumptions — investments, ventures, major commitments — ensuring you survive when assumptions prove wrong
Management & Thinking
Personal SWOT Analysis
Assessing your position within a specific decision context — strengths, weaknesses, opportunities, and threats
Investment & Finance
Munger's Decision Checklist
Running a major decision through Munger's multi-mental-model filter before committing