While constitutionalism appears to be a new buzzword in political, public and analytical Eurospeak, it is never quite clear whether there are any shared terms of reference in this debate in “Europe,” let alone on a worldwide scale. To sort out the different approaches and their analytical strengths and weaknesses, this article offers an overview of analytical choices that are likely to determine the type and outcome of discussions about the constitutional significance of the European Union's Charter of Fundamental Rights (hereafter: the Charter). (2) It juxtaposes the seemingly paradoxical parallel development of a widespread use of “constitutionalism,” and increasingly “constitutionalization,” on the one hand, and the theoretical and political divergence in its application, on the other.