The onset of the Anthropocene, an era in which human actions have become major drivers of change on a planetary scale, has increased the complexity of socioecological systems. Complex systems pose novel challenges for governance because of their high levels of connectivity, nonlinear dynamics, directional patterns of change, and emergent properties. Meeting these challenges will require the development of new intellectual capital. In this book, Oran Young argues that to achieve sustainable outcomes in a world of complex systems, we will need governance systems that are simultaneously durable enough to be effective in guiding behavior and agile enough to adapt to rapidly changing circumstances. While some insights from past research on governance remain valid in this setting, Young argues that we need new social capital to supplement mainstream regulatory approaches that feature rule making with an emphasis on compliance and enforcement. He explores the uses of goal setting as a governance strategy, the idea of principled governance, and the role of what is often called good governance in meeting the challenges of the Anthropocene. Drawing on his long experience operating on the science/policy frontier, Young calls for more effective collaboration between analysts and practitioners in creating and implementing governance systems capable of producing sustainable outcomes in a world of complex systems.