The Convention established 11 working groups to deal with the key issues of subsidiarity; the charter of fundamental rights; the legal personality of the European Union; the role of national parliaments, of which I was a member; complementary competences, that is, the areas in which the European Union and member states share competences; economic governance; external action; defence, of which I was also a member; the simplification of legislative procedures and instruments; the European area of freedom; security and justice, and social Europe.