This chapter focuses on the fact that a major difference between a change in an international order and a change of international order is that the scope and depth of the former are not as great as those of the latter—in other words, change unfolding in an international system is somewhat circumscribed. To reflect on a change in the international order and what this means for its legitimacy, this chapter focuses on three points. First, it examines some of the characteristics that facilitate change in an international system and what this implies for the sense of legitimacy. Second, it mentions the reforms that an international order and its legitimacy can adopt to respond to evolving pressures, alluding to the stress faced by the current international system in the last few years. Third, this chapter ends with an overview of the systemic risk to which the present international system is exposed.