This chapter discusses IST itself as well as the research design of the book. It provides a detailed exposition of the key variables of the theory: the status-seeking strategies of rising powers, institutional openness, and procedural fairness. It discusses the causal mechanism that explains the impact of openness and fairness on a rising power’s status and corresponding choice of strategy. It generates four possible strategies a state may follow: cooperate, challenge, expand, and reframe. On research design, the chapter describes the scope conditions of the theory, definitions of key concepts, case selection, research methodology and sources, and the observable implications of the theory and how they differ from the observable implications of alternative (materialist) explanations.