Moving from the basic elements of philosophy and methodology of the social sciences, the course will deal with some of the explanatory theoretical models used in international relations (IR) literature in order to answer questions like: “Why do crises emerge, or wars break out?”; “How do states deal with their security in different situations?”; “According to what strategic patterns do states negotiate, enter into conflict, and form alliances?”; etc. Several examples taken from case studies in IR will empirically illustrate the social scientific explanations provided.