This chapter explores the intricate dynamics of International Governmental Organizations (IGOs) through the lenses of bounded rationality and organizational sensemaking. The text begins by presenting the challenges faced by IGOs, using the example of the World Health Organization (WHO) during health emergencies, to highlight the complexities of resource mobilization and coordination in unpredictable environments. The discussion then shifts to how IGOs, like all organizations, must navigate uncertainty by creating and sustaining meaning within their operations. This process of sensemaking involves establishing a shared interpretation of reality, which influences decision-making and organizational action. However, the chapter emphasizes that while bounded rationality strategies—such as heuristics and routines—help manage uncertainty, they can also lead to organizational rigidity and path dependency, creating challenges for adaptation in a changing environment. The chapter further delves into the concept of organizational change, arguing that reform is often utilized by IGOs as a tool for legitimization. However, this change is not always substantive, as organizations may fall into cycles of perpetual reform that do not necessarily result in meaningful outcomes. The discussion also touches upon the paradoxical nature of sensemaking within organizations, where the need to interpret and give meaning to reality can create both clarity and constraints. These interpretations, once solidified, can become difficult to alter, even in the face of new challenges. Throughout the chapter, various examples are used, such as the World Bank and IMF’s handling of the Mexican economic crisis in the 1990s, to illustrate how groupthink and organizational blindness can emerge from rigid sensemaking processes. The chapter concludes by reflecting on the implications of bounded rationality and sensemaking for the resilience and performance of IGOs, suggesting that while these strategies are essential for organizational functioning, they must be balanced with flexibility and adaptability to avoid becoming counterproductive.