It could be argued that since the dawn of the peace-building era in the early 1990s, public participation in constitution-making processes has developed into a transnational legal norm. International organizations, NGOs, CSOs, scholars and think tanks around the globe repeatedly stress the value of including ordinary citizens in the making of their founding laws. As a consequence, the practice of participatory constitution-making has also increased. Though this is a seemingly established transnational legal norm, it is still a norm that has been more or less successfully adopted in different contexts. This article takes an interest in exploring why this is so. How is it that this norm is institutionalized in some contexts, internalized in others, institutionalized and internalized in yet other contexts, and simply rejected in still other contexts?