The Treaty of Lisboa contains several new provisions which will affect the European Security and Defence Policy (ESDP). In addition to renaming the ESDP to the Common Security and Defence Policy (CSDP) and codifying existing paractice, the treaty wil bring about substantial changes in some areas. This report highlights three of these: The institutional reforms, in particular the appointment of a new High Representative of the Union for Foreign Affairs and Security Policy, will reduce the importance of the rotating EU-Presidency. The new role of the High Representative together with the new External Action Service should, however, create the conditions for a coordinated and coherent foreign policy in the EU. The permanent structured cooperation will make it possible for a core group of member states to deepen cooperation in the area of capability development. The Solidarity Clause may un the longer term lead to discussions on a broader interpretation of the ESDP. The Treaty of Lisbon, however, only stipulates the overarching provisions for these changes and there is still much room for negotiation with regard to the design of the future cooperation. From a Swedish perspective it is therefore particularly important to develop a national position on the role of the rotating Presidency, the inclusiveness of the External Action Service, the design of the permanent structured cooperation of the implementation of the Solidarity Clause.