Your circle of competence is specific knowledge about the world that you've built up over the years, through study or experience. Beyond that, can you expand your circles of competence re but oftentimes it takes a lot of time. If i wanted to work on a business where i'm operating outside of my circles of competence, like the two i just mentioned, i need to understand that my odds are lower than other subject matter experts from the industry. Momentum thinking is reserved for those builders that default to action and make things happen rather than wait for things to happen.