Seminar paper from the year 2010 in the subject Politics - International Politics - Topic: European Union, grade: A, University of Flensburg, language: English, abstract: European Union consists of a unique integration model not only due to the long term and ongoing process but also because of the Institutions and regulations under 27 Member States, which attempt to comprise and mostly to harmonize the national laws. Especially after Maastricht Treaty, when the supranational building of the EU was introduced plenty of reforms had introduced in order to increase from the one hand the effectiveness of the complicated and bureaucratic body of EU and from the other hand to control the way that European Union and the individual Member States function in a more effective and productive way. After the adoption of a single currency- the Euro- for sixteen of the Members of the EU in parallel of the important enlargement the structural body of the EU became even more complicated that needed the consistent control whether structural reforms had to be introduced in order the effective function of the EU was to be assured. Under these circumstances, the financial sector is of the greatest importance within the EU as it is -so far- the basement of the integration model and consists of the guardian of deepening integration within the EU. Therefore, the supervision and the reforms in financial services within EU has increased dramatically from 1993, after the Maastricht Treaty and the introduction of supranationality, through 2004-with the great Eastern enlargement and finally until now that the current financial crisis consisted a shock for EU, that attempted to implement new measures and to establish institutional changes in order to supervise the financial sector effectively in a long term.