Turkey's EU membership process began in 1963 with the signing of the Ankara Agreement. The Customs Union was established on January 1, 1996, after Turkey's candidacy for full membership in the EU was rejected in 1989. Turkey's success in this process, as well as the fact that the EU accepted numerous states from Central and Eastern Europe until the 1990s, encouraged Turkey's attempts to join the EU as a full member. Problems developed in relations during the 1997 Luxembourg Summit as a result of Turkey's special political situation in comparison to the other candidate states, but progress was achieved in Turkey's membership process at the 1998 Cardiff Summit. As a consequence, Turkey was approved as a candidate state to the EU on the same level as other candidate countries at the Helsinki Summit in 1999. Turkey was expected to create a National Program for the adoption of the EU acquis in accordance with the Copenhagen criteria, which were approved in 1993. At the summit, it was agreed that accession talks with Turkey would begin after Turkey had met all of the Copenhagen requirements. On March 19, 2001, the Council of Ministers approved the National Program created for this aim. The implementation of the EU acquis by Turkey, as well as the process of negotiating for EU membership, will be addressed and analyzed in this research.