The European Economic Area is a regional cooperation scheme which connects the EU and the European Free Trade Association States parties to the EEA Agreement, extending the EU’s internal market to the latter. The relationship between EU Member States and EEA/EFTA States is characterised by legislative and judicial dialogue through supranational institutions. This special relationship is marked by the creation of a large economic block, with mirroring institutional and political counterparts. Arguably, there is no other regional arrangement in the world which is equally entwined with the EU. This chapter focuses on the participation of both the EU and the EEA/EFTA States in joint legal and political decisionmaking, while analysing the dynamic elements of the EEA, such as the guarantee of homogeneity between legal orders. Particular emphasis will be given to the interplay between the EU Courts and the Court of Justice of the European Free Trade Association.