What is The 90% Rule?
A decision filter from Essentialism: when evaluating an opportunity, if it doesn't score at least 90% on your most important criterion, treat it as a 0, a clear no. Eliminates the agonizing middle ground between "kind of good" and "great."
My perspective
In practice
Applied to commitments, projects, and priorities. The rule forces discipline: saying no to good opportunities in order to say a full yes to great ones.