8 Following subsequent negotiations on an amending treaty, the Single European Act (ECI) was adopted in 1986 and came into force in 1987. It was not a treaty creating a European Union, as proposed by the Genscher-Colombo plan and the solemn declaration, but it was the first major revision of the founding treaties and a decisive step towards the creation of the European Union. Although quantitatively limited, the SEA has resulted in a series of notable changes. The most important thing is that it has a majority in the Council in the most important areas of the internal market, which has led to unprecedented legislative activity within the Communities. The establishment of a broad deregulation and harmonization programme aimed at completing the creation of a common market by 1992 has contributed to the achievement of the economic objectives of the Treaty of Rome. The SEA also introduced the cooperation procedure, which for the first time gave the European Parliament a visible role in the legislative process of the Communities. The scope of the Communities has been broadened, whose powers now include more environmental protection, health and safety in the workplace, research and development, and economic and social cohesion. In addition, the summits of heads of state and government have been formalised as the `European Council`. Finally, the SUP codified the CPE, which then evolved into a Common Foreign and Security Policy (CFSP). The EU works through a hybrid supranational and intergovernmental decision-making system. The seven most important decision-making bodies – the institutions of the European Union – are the European Council, the Council of the European Union, the European Parliament, the European Commission, the European Court of Justice, the European Central Bank and the European Court of Auditors. 6 After the failure of Fouchet`s plans and a decade of uncoordinated foreign policy by the Member States, a preliminary step towards political cooperation was taken in October 1970, when the foreign ministers agreed on closer cooperation on foreign policy issues.