During the 1960s, scholars became increasingly interested in how the steady diffusion of the behavioralistic approach was related to the gradual dissipation of attention to the normative or substantialrational questions with which political theorists traditionally occupy themselves. Dahl responds in various writings, for instance in the first edition of Modern Political Analyses, to allegations that his colleagues occupy themselves with trivial matters and are value-relativists. The epistemological discussions within political science were for the most part ignored during that expansion. The tasks that Dahl still sees for political philosophy are for the most part identical to those distinguished by Arnold Brecht in his seminal Political Theory: The Foundations of Twentieth-Century Political Thought. To accept the scientific method implies what Brecht calls scientific value relativism: the notion that it is impossible to establish what is valuable on scientific grounds. The ascendancy of the intervention sciences is a significant manifestation of the rationalization of western society.