The rationalist–constructivist debate is an ontological debate within international relations theory between rationalism and constructivism. In a 1998 article, Christian Reus-Smit and Richard Price suggested that the rationalist–constructivist debate was, or was about to become, the most significant in the discipline of international relations theory. The debate can be seen as to be centered on preference formation, with rationalist theories (such as neorealism) characterising changes in terms of shifts in capabilities, whereas constructivists focus on preference formation.