It’s said that security is indivisible. But to the same extent that security cannot be subdivided, threats to security can be reduced to smaller units and analysed individually. This collection of articles subjects security – inevitably a central, existential concern for every state, nation and individual – to a somewhat more multifaceted treatment. The aim of this collection is to provide a new impulse for stronger cooperation. Particularly noteworthy is that the book brings together a wide variety of European voices pursuing a common goal. This sounds very optimistic and also necessary, as we cannot afford long and cumbersome processes, especially in the field of security policy. Threats and crises have the capacity to hit us with sudden inevitability, as the civil war in Libya has demonstrated. We must be able to act at the moment of crisis, not only later. Preference is given to a proactive security policy that is focused on avoiding all crises and military conflicts from the outset. Thus, this collection of ideas is being published at the right time. We are in dire need of a broad debate on the future of European Common Security and Defence Policy that brings together as many clever thinkers as possible. The following pages are well suited to acting as a starting point for such a debate.