This is based on the Pareto Principle which states that, for many events, roughly 80% of the effects come from 20% of the causes. Popularized by Tim Ferriss on his podcast and in his book the four hour work week.
- What 20% of the things you do account for 80% of your results?
- What 20% of your clients account for 80% of your earnings?
- What 20% of your materials go into 80% of your goods.