This paper examines how Wolfgang Schluchter, in his later works culminating in Grundlegungen der Soziologie (2006/07), tackled the problems unsolved in his early work, Die Entwicklung des okzidentalen Rationalismus (1979): how to locate appropriately the Weberian research program among the competing sociological approaches and how to reconstruct the Weberian approach as a research program encompassing both micro- and macro-sociology. It also clarifies how his relationship with the major theoretical frames of reference has changed in the course of the development of his Weber-interpretation. As for the reconstruction of Weberian theory of societal development, Schluchter, while recognizing a strained coexistence of evolutionary and comparati...