“…However, within IR's practice turn, several authors have recently added to (and questioned) this conceptualization of change in practices, identifying different forms of change (Villumsen Berling 2012, 455–56, 468–69; Ringmar 2014, 17–20; Schindler and Wille 2015; Hopf 2018). Specifically with regard to change in international law, Jutta Brunnée and Stephen Toope (2010, 2018a, 2018b, 2019) recently extended their ‘interactional’ framework to argue that legal change and contestation are rooted in, and constrained by, the continued assessment of legal norms as fulfilling the requirements of legality. As in their earlier work, they base their approach on the work of Lon Fuller, and identify a set of legality requirements including promulgation, non-retroactivity, constancy, and clarity (Brunnée and Toope 2010).…”