Inter-organizational relations and practices - formal and informal - seem to be everywhere; and the tasks of description, explanation and 'prescription' of inter-organizational arrangements and their attributes have become important scholarly challenges. Turning the spotlight on this profoundly engaging topic, this five-volume set brings together articles from internationally-renowned scholars, seeking to address the various questions that have arisen; the forms of analysis that have developed in the field; the accumulation of theoretical and empirical knowledge about IOR; the continuing debates; and to offer suggestions about the next generation of research. Overseen by an international team of editors who provide a map of the field through a new comprehensive introduction, this work will be of interest to scholars across a wide range of disciplines, and is structured to reflect both chronology in development of the topic, and the conceptual and empirical knowledge that has accumulated. Volume One: Inter-organizational Relations: Basic Concepts and Formation of the Field Volume Two: The Structure and Governance of Inter-organizational Relations Volume Three: Understanding Inter-organizational Relations in Context Volume Four: Understanding Inter-organizational Relations as Process Volume Five: Inter-organizational Relations: Current Debates and Future Research