The Single European Act (SEA) contains a series of amendments to the Treaty of Rome that made it easier to negotiate the directives needed to make the single market work. The key innovation in the SEA was to extend the use of majority voting in place of unanimity in the EU’s main decision-making body. Without majority voting, it would have been impossible to have passed the more than 280 separate items of legislation required to eliminate internal EU frontiers and have the single market ready by the end of 1992. The measures already adopted relate to: