This book studies the justice concerns of political actors in important international regimes and international and domestic conflicts and traces their effects on peace and conflict. The book demonstrates that such justice concerns play an ambivalent role for the resolution of conflicts and maintenance of order. While arrangements that actors perceive as just will provide a good basis for peaceful relations, the pursuit of justice can create conflicts or make existing ones more difficult to resolve. The Chapter "Justice from an Interdisciplinary Perspective: The Impact of the Revolution in Human Sciences on Peace Research and International Relations" by Harald Muller is available open access under a CC BY 4.0 license at link.springer.com.