IR Epistemology and IR theory

IR theories can be roughly divided into one of two epistemological camps: "positivist" and "post-positivist". Positivist theories aim to replicate the methods of the natural sciences by analysing the impact of material forces. They typically focus on features of international relations such as state interactions, size of military forces, balance of powers etc. Post-positivist epistemology rejects the idea that the social world can be studied in an objective and value-free way. It rejects the central ideas of neo-realism/liberalism, such as rational choice theory, on the grounds that the scientific method cannot be applied to the social world and that a "science" of IR is impossible.

A key difference between the two positions is that while positivist theories, such as neo-realism, offer causal explanations (such as why and how power is exercised), post-positivist theories focus instead on constitutive questions, for instance what is meant by "power"; what makes it up, how it is experienced and how it is reproduced. Often, post-positivist theories explicitly promote a normative approach to IR, by considering ethics. This is something which has often been ignored under "traditional" IR as positivist theories make a distinction between "facts" and normative judgments, or "values".

During the late 1980s and the 1990s, debate between positivists and post-positivists became the dominant debate and has been described as constituting the Third "Great Debate" (Lapid 1989).