Differentiated integration (DI), whereby some MS opt out or are excluded from certain common EU policies for sovereignty or capacity reasons, may be thought to undermine the EU’s functioning as what John Rawls called a fair scheme of cooperation, grounded in norms of impartiality and...

There is now an abundant conceptual and empirical literature on differentiated integration in the EU. However, what are academic experts’ more political and normative views on the matter? This paper enlarges our knowledge about how academic experts perceive of DI in general, as well as about...