This article deals with the research tradition of Radical Constructivism and proposes four central claims for its theoretical, methodological and epistemic orientation and status. First, Radical Constructivism should be viewed as a comprehensive empirical research tradition with an emphasis on cognition, learning, living systems and organization which, in addition, developed a new general methodology for scientific operations. Second, the main opponent of Radical Constructivism, especially in the research program of Heinz von Foerster, does not lie in philosophical or epistemological terrains (...) but in the area of the general scientific methodology and in its conventional mode of exploring the world. Third, Radical Constructivism proposed a new and alternative way for scientific explorations and world-making which produces, additionally, tangible and non-trivial effects with respect to scientific outcomes. Fourth, due to this new way of scientific world-making and due to its novel scientific methodology Radical Constructivism was only marginally interested in epistemological issues. Instead, the empirical research tradition of Radical Constructivism offered intriguing answers why the varieties of scientific realism and its allies like scientific objectivity seem so appealing and almost self-evident. -/- . (shrink)