‘Responsibility to Protect and Prevent: Principles, Promises and Practicalities’ explores the evolution of responsibility to protect (R2P), a principle which – according to its supporters – has evolved into a new type of responsive norm for how the international community should react to serious and deliberate human rights violations. Arguing that the R2P ethos has been misunderstood and used ineffectively, this work defends the validity of R2P and urges for a more practical understanding that moves beyond theory. The progression of R2P from an initial concept to formal ratification has been a very difficult one, with a great deal of disagreement over its validity as a substantive norm in international affairs. The key disagreement is not that protection or prevention are unimportant, but rather how the fine-sounding R2P principles are supposed to work in practice. This volume presents a number of important arguments that are directly related to the state vs. human security debate, with a critical analysis of the nexus between the protection verses prevention theses. Through the case study of the Libyan Crisis, Janzekovic and Silander offer an example of the R2P thesis in action, and support the claim that prevention should be more than an adjunct to protection.