This document discusses lean metrics for startups. It begins by explaining that traditional accounting metrics are not helpful for evaluating entrepreneurs. It then discusses what makes a good metric according to lean startup principles - that metrics should be comparative, understandable, and change user behavior. The document provides examples of lean metrics used at the New York Times and outlines the stages of metrics from empathy to scale. It also discusses how to use metrics when fundraising and what investors look for like active users and revenue potential.