Under the guidance of members of the Aspen Philanthropy Group, PSI has launched a series of workshops to identify points of agreement among practitioners and their public and private grant-makers when it comes to metrics and tools for assessing social impact. These workshops are populated by practitioners from grant-seeking organizations, analysts who research and write about M&E systems, principals of family foundations and USG representatives. Workshop participants review the work already completed by others to design effective M&E systems, identify those approaches that have proved (or promise to be) most relevant to decision-making and continuous learning and take consensus-building efforts the “last mile” by communicating agreement reached to the wider donor community, including small donors and principals of family foundations.