This book clarifies factors that play an important role in securing the effectiveness of legal regimes that aim to protect public interests of the international community. In Part 1, the authors focus on theoretical problems arising in the implementation process of those legal regimes from both a constitutional and functional perspective. In Parts 2 through Part 4, they pay attention to practical issues in the implementation process of particular legal regimes, in light of what interpretation or measures are legitimate from the perspective of protecting public interests. This book incorporates an idea of public law into the theoretical framework of international law which has been mainly constructed on the theory of private law in domestic legal systems. In contrast to many books which focus on the role of the procedural and material factors in the implementation process of various institutions and rules, this book emphasises the role of normative factors in securing effectiveness of public interests-oriented rules and is a valuable resource for both academics and policy makers working in this area.