Early German hermeneuticians such as Wilhelm Dilthey pioneered the distinction between natural and social science ('Geisteswissenschaft'). This tradition greatly informed Max Weber and Georg Simmel's antipositivism, and continued with critical theory. Since the 1960s, a general weakening of deductivist accounts of science has grown side-by-side with critiques of "scientism", or 'science "as ideology"'. Jürgen Habermas argues, in his "On the Logic of the Social Sciences" (1967), that "the positivist thesis of unified science, which assimilates all the sciences to a natural-scientific model, fails because of the intimate relationship between the social sciences and history, and the fact that they are based on a situation-specific understanding of meaning that can be explicated only hermeneutically … access to a symbolically prestructured reality cannot be gained by observation alone." "Verstehende" social theory has been the concern of phenomenological works, such as Alfred Schütz "Phenomenology of the Social World" (1932) and Hans-Georg Gadamer's "Truth and Method" (1960). Phenomenology would later prove influential in the subject-centred theory of the post-structuralists.