Composing Peace: Mission Composition in UN Peacekeeping is about mission composition in peacekeeping operations and asks how diversity of mission composition influences the ability of a peace mission to keep the peace. This book focuses on four types of mission composition-diversity among peacekeepers, within the mission leadership, between mission leaders and peacekeepers, and between peacekeepers and locals. It is the first book to explore mission composition and its consequences, unpacking a concept hitherto unexplored and empirically combining quantitative and qualitative methods. It makes an important contribution to the fields of peace research, security studies, and international relations at large.