Chapter 2 reviews how International Relations (IR) scholarship has been treating individual agency, especially within the dominant theoretical frameworks, Realism, Liberalism, and Constructivism. Various analytical perspectives, such as the “levels-of-analysis,” foreign policy analysis, and the transnational relations approach, have reserved room for the analysis of individuals in world politics. But concerns about academic discipline formation and real-world relevance have led to a widespread neglect of individual actors. While James Rosenau’s research and the integration of social theory into IR offer fruitful ways of thinking about individual agency, they often overemphasize the structural situatedness of actors fulfilling social roles. Revisiting the structure–agency debate, the chapter takes inspiration from Margaret Archer’s sociological insights in order to propose that agency should be analyzed as a variable with an intrasubjective and an intersubjective dimension, which always requires contextual specification. Power, it is argued, should be seen as a disposition, and its exercise vis-à-vis other actors as an intentional project.