Are theories of governance useful for helping policymakers and citizens meet and tackle contemporary challenges? This insightful book reflects on how a theory becomes useful and evaluates a range of theories according to whether they are warranted, diagnostic, and dialogical. By arguing that useful theory tells us what to ask, not what to do, Christopher Ansell investigates what it means for a theory to be useful. Analysing how governance theories address a variety of specific challenges, chapters examine intractable public problems, weak government accountability, violent conflict, global gridlock, poverty and the unsustainable exploitation of our natural resources. Finding significant tensions between state- and society-centric perspectives on governance, the book concludes with a suggestion that we refocus our theories of governance on possibilities for state-society synergy. Governance theories of the future, Ansell argues, should also strive for a more fruitful dialogue between instrumental, critical and explanatory perspectives. Examining both the conceptual and empirical basis of theories of governance, this comprehensive book will be an invigorating read for scholars and students in the fields of public administration, public policy and planning, development studies, political science and urban, environmental and global governance. By linking theories of governance to concrete societal challenges, it will also be of use to policymakers and practitioners concerned with these fields.