Multilateral negotiations are complex interactions. This course investigates social structure of mutilateral negotiations in the context of the EU negotiations, and offers theoretical frameworks to explain different angles of multilateral negotiations. At empirical level the course addresses the negotiations in the EU in three different levels. First, the course analyzes negotiations between the member states and the EU institutions and the institutionalized Patterns of bargaining, second the course addresses the negotiations between the major EU institutions, namely, the Commission, the Council of the EU and the European Parliament. Third, the course addresses the negotiations patterns between the EU and non-members, specifically through the enlargement negotiations underway since 1997.