Enhanced co-operation (sometimes called flexibility) is the term used for the procedure which allows a number of member states to use the institutions of the European Union (EU) to promote closer co-operation among themselves.
In order to use these provisions, there are various conditions to be met. Among these conditions are:
The procedure cannot be used in areas where the EU has exclusive competence. If it is being used in relation to common foreign and security policy it must be unanimously approved by the Council. In other areas, it must be backed by the Commission, approved by the Council (by qualified majority voting) and approved by the European Parliament.