The integration process of the EU which began in the 1950s is featured by the primacy and priority of economic dimension. The social dimension in the process of integration has been not as much as economic dimension for a long time because member states are reluctant to transfer their competences to the supranational level. Social Europe is presently a multi-level system that national policies and supranational rules aiming at coordinating national social security systems exist at the same time. However, the integration and liberalization of the economy challenge this situation between the national and the supranational level. In the 1990s, the Open Method of Co-ordination (OMC) is created, which is claimed by the EU to circumvent the intergovernmentalist barriers. Since 2001, the OMC has been applied to pensions. This thesis seeks to analyze whether the EU is effective in coordinating pension reforms of member states through OMC by analyzing the pension reforms of three chosen countries – Germany, Sweden, and the UK. Then the effectiveness of the OMC would be discussed through normative, cognitive and procedural dimensions. It could be concluded that the impact of OMC on the formation of national pension reform agenda is limited by the path dependency of feasible reform. Until now the OMC has shown limited capacity in coordinating the pension reforms of member states.