The Organisation for Economic Co-operation and Development is a much cited but little studied institution, and its role in international governance is poorly understood. Nevertheless, the OECD plays an important role in the emerging structure of global governance. Focusing upon the OECD’s core functions, contributors to this volume trace the OECD’s history, structure, and role in international governance as well as its function as a “policy ideas generator” and purveyor of “best practices” in a variety of economic and social policy domains.