This collection of essays brings together scholars from various disciplinary backgrounds, based on three continents, with different theoretical and methodological interests but all active on the topic of complex systems as applied to international relations. They investigate how complex systems have been and can be applied in practice and what differences it makes for the study of international affairs. Two important threads link all the contributions: (i) To which extent is this approach promising to understand global governance dynamics? (ii) How can this be implemented in practice?

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Quantitative research evaluating the effect of peacekeeping operations usually links conflict abatement to the number of casualties in order to measure mission success. Such an approach is incomplete as security concerns extend far beyond the number of conflict related deaths. This narrow understanding of mission success leaves a significant assessment gap. Therefore this study is the first which presents comprehensive data using a wider understanding of violence and peace. We apply 11 indicators measuring security comprehensively. These range from the number of battle death, to violence against civilians, domestic unrest as well as domestic governance and political stability. In contrast to the mainstream quantitative literature our analysis shows that conflict often persists even with the deployment of peacekeepers. The absence of war (decline of battle death) does not automatically equate for non-violence and peace. In order to explain variation between cases we are also exploring the significance of different peacekeeping types, the size of developmental aid, rents from natural resources and the role of governance on conflict.