From the Centro Militare di Studi Strategici (CeMiSS), Rome, Italy:

Eroding State Authority? Private Military Companies and the Legitimate Use of Force
This study probes the question of how the rise and development of private military companies (PMCs) is affecting the authority of Western states to define and regulate the use of force. It is an inquiry into the extent to which private military companies are merely “tools” in the hands of the state, as often assumed. It is an inquiry into the extent to which the delegation of tasks to private actors also entails a privatisation of authority. It is an attempt to think about a link whose existence is often denied. In a typical vein one observer writes:

...most would argue that the power to authorise and delegate the use of military force should remain with states, preferably at the level of the UN Security Council. But once agreed, exactly what or who is deployed is less important – the issue then is to find the most effective and least costly alternative... (Shearer 2001: 30).

This report asks whether cost effectiveness is really the issue at stake and whether who is deployed is of limited importance. The political intuition it departs from is that who “is deployed” matters a great deal. It is absolutely essential for governments, for armed forces and for citizens not only to ask “what is most effective and least costly” alternative. They also need to ask what consequences different alternatives have for the authority over the use of force (and more specifically the state monopoly on the legitimate use of force). The aim of this study is first and foremost to spell out the lines along which such questions have to be asked and discussed...