- Published
- Updated July 13, 2026
- Life by Design > Mental models > Circle of Competence
Mental Models for solopreneurs
How to use Circle of Competence by Warren Buffett / Charlie Munger
1 Mindset shift
2 When to use it
3 How to use it
Being good at some things doesn't make you good at everything. Know the limits of your expertise & operate within them.
When making decisions in unfamiliar areas.
Ask whether you truly understand the domain. Seek help or learn before acting outside your expertise.
Nicholas Robb
Founder, Design Hero
Author of Life by Design
Nicholas@lifebydesign.online