Euro crisis reforms as major example of interstitial institutional change in the EU - Forms of institutional change : unusual sources of law, new tasks for the EU institutions, new organs, competence creep, institutional hybrids, and more differentiated integration - Question whether some or all of this amounts to a ‘constitutional mutation’ of the EU legal order - Reasons to doubt whether the constitutional fundamentals have changed - Alternative thesis: increased institutional variation, deepening the differences between EMU law and the rest of EU law.
