Institutional designs matter. The concluding chapter discusses the implications of this finding in four sections. The first section summarizes the key findings of the book. The second section outlines recommendations for the three organizations under scrutiny. In particular, peace operations led by the EU urgently require institutional adjustments to become more effective. The last two sections address how this book’s findings can be generalized. There are limitations with respect to the research design underpinning the analysis. After discussing these, the last section elaborates how this book contributes to the literature on peacebuilding and international public administration, respectively. The thesis is put forth that the dynamic nature of complex principals’ political preferences correlates negatively with bureaucratic performance during policy implementation, in peacebuilding and beyond. Institutional designs, in particular decentralization and bureaucratic autonomy, mediate this unwieldy effect. National interests are not going anywhere. But there is increasing bureaucracy in world politics today, and we would do well to learn as much as possible about how it can offset national politics’ unfortunate side effects.