  Consequently, Waltz sees power and state behavior in a different way from the classical realists. For Morgenthau power was both a means and an end, and rational state behavior was understood as simply the course of action that would accumulate the most power. In contrast, neorealists assume that the fundamental interest of each state is security and would therefore concentrate on the distribution of power. What also sets neorealism apart from classical realism is methodological rigor and scientific self-conception (Guzinni 1998, 127–128). Waltz insists on empirical testability of knowledge and on falsificationism as a methodological ideal, which, as he himself admits, can have only a limited application in international relations. 