Post-positivist/reflectivist theories

International society theory (the English school)

International society theory, also called the English School, focuses on the shared norms and values of states and how they regulate international relations. Examples of such norms include diplomacy, order, and international law. Unlike neo-realism, it is not necessarily positivist. Theorists have focused particularly on humanitarian intervention, and are subdivided between solidarists, who tend to advocate it more, and pluralists, who place greater value in order and sovereignty. Nicholas Wheeler is a prominent solidarist, while Hedley Bull and Robert H. Jackson are perhaps the best known pluralists.

Social Constructivism

Social Constructivism encompasses a broad range of theories that aim to address questions of ontology, such as the Structure and agency debate, as well as questions of epistemology, such as the "material/ideational" debate that concerns the relative role of material forces versus ideas. Constructivism is not a theory of IR in the manner of neo-realism, but is instead a social theory which is used to better explain the actions taken by states and other major actors as well as the identities that guide these states and actors.

Constructivism in IR can be divided into what Hopf (1998) calls 'conventional' and 'critical' constructivism. Common to all varieties of constructivism is an interest in the role that ideational forces play. The most famous constructivist scholar, Alexander Wendt noted in a 1992 article in International Organization (later followed up by a book, Social Theory of International Politics (1999)), that "anarchy is what states make of it". By this he means that the anarchical structure that neo-realists claim governs state interaction is in fact a phenomenon that is socially constructed and reproduced by states.

For example, if the system is dominated by states that see anarchy as a life or death situation (what Wendt terms a "Hobbesian" anarchy) then the system will be characterised by warfare. If on the other hand anarchy is seen as restricted (a "Lockean" anarchy) then a more peaceful system will exist. Anarchy in this view is constituted by state interaction, rather than accepted as a natural and immutable feature of international life as viewed by neo-realist IR scholars.