Final answer:
Kenneth Waltz's 1959 book 'Man, the State, and War' introduced a framework for analyzing international relations at three levels: individual, state, and international system.
Step-by-step explanation:
The 1959 book Man, the State, and War introduced the now-common framework of images, or levels of analysis, which has been highly influential in the study of international relations. This framework looks at political science and international relations at different scales to better understand the decisions made by actors in the international system. These levels include the individual, analyzing the actions and motivations of leaders; the state, looking at domestic politics and national interests; and the international system, considering the interactions between states, international organizations, and non-governmental entities.