European Fiscal Compact
There are several different forms closer integration both within and outside the EU's normal framework. The main mechanism is enhanced cooperation where nine or more states can use EU structures progress in a field that not all states are willing to partake in. One example of this is the European Public Prosecutor. A similar mechanism is Permanent Structured Cooperation in Defence, where the majority of EU states work in a flexible manner on defence cooperation. Other projects, such as the European Fiscal Compact, operate between EU members but as a separate intergovernmental treaty outside of the official EU structures.