To most contributors in this volume, international organizations (IOs) act both as agents of, and inhibitors of peaceful change. This leaves the task of identifying exactly how and why they foster or inhibit peaceful change to empirical analysis and mid-level theorizing. Yet, as Ian Hurd points out in his chapter, understanding the deep power politics at play in institutionalized peaceful change requires a higher level of theorizing. This concluding chapter takes stock of the collective findings in light of Hurd’s cautionary tale and suggests future avenues of research engaging with postpositivist, relational, and critical theories. It identifies three main areas in need of further theorizing: the agents, the stakes, and the processes of peaceful change. It argues that such further theorizing would not only shed light on transformative processes of maximalist peaceful change which are yet to be fully explored in this volume, but it would also help develop a more pluralistic research agenda.