This chapter seeks to establish the role that the norm of the rule of law plays in the new constitutionalism, by establishing that the commonality of the rhetoric of the rule of law has seen it rise to a level of received wisdom or common sense in global politics. The chapter maps the problems with defining the norm before examining the role of agency in the widened use of and appeal to the rule of law. Without dismissing structural explanations, it concludes that the normativity of the rule of law is (re)produced through professional practice and technical legal assistance.