This document discusses using data and metrics to tell impactful stories and drive meaningful change. It covers four key lessons: only collect data you will act on, understand how measures create incentives, be careful of "vanity metrics" on the web, and use data to tell a compelling story. The document also describes a group exercise where participants discuss sharing data successfully, and identifies three trends in the social sector: openness through transparency, data as a product, and harnessing mobile connectivity. The overall message is that data should be used strategically to inform actions and decisions that further an organization's mission and create positive impact.