This report explores the Packard Foundation's experience with program evaluation as a strategic intervention in its work on children's health insurance and presents some of the principal lessons learned from that experience. The report also highlights the value of being opportunistic and adaptive to changing circumstances. The Packard Foundation experience suggests that to have a major impact on the issues that it cares about, a foundation has to be on the lookout for windows of opportunity to advance its agenda, and must be highly strategic in leveraging those opportunities if and when they occur
