Purpose -The paper aims to present the main perspectives and conclusions of a doctoral research in the history and philosophy of science conducted in France and Austria by the author on the project of "general systemology" (or "general system theory") instigated by Ludwig von Bertalanffy. Design/methodology/approach -A genealogical enquiry accounts for its scientific, philosophical and more generally cultural origins. Its genesis in Bertalanffy's works between 1926 and 1944 is explained. The process that led it to become a collective project is then discussed: the history of the Society for General Systems Research is considered, the ambivalence of its role with regard to general systemology being demonstrated. Finally, the unity of the diverse contributions to the latter's development is asserted in a framework put forward by the author in order to account for its structure and functions. Findings -While stating a comprehensive view of its history, the paper characterizes general systemology as the project of a general science of systemic interpretation of the "real" which remains topical, although it was never fully actualized. Originality/value -A new insight is thus provided on the scope and meaning of this hermeneutics: it meets the contemporary need for a better understanding of the foundations of systems research.

In this article, we review how two eminent Viennese system thinkers, Paul A Weiss and Ludwig von Bertalanffy, began to develop their own perspectives toward a system theory of life in the 1920s. Their work is especially rooted in experimental biology as performed at the Biologische Versuchsanstalt, as well as in philosophy, and they converge in basic concepts. We underline the conceptual connections of their thinking, among them the organism as an organized system, hierarchical organization, and primary activity. With their system thinking, both biologists shared a strong desire to overcome what they viewed as a "mechanistic" approach in biology. Their interpretations are relevant to the renaissance of system thinking in biology--"systems biology." Unless otherwise noted, all translations are our own.

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The history of "general system theory" is investigated in order to clarify its meanings, vocations, foundations and achievements. It is characterized as the project of a science of the systemic interpretation of the "real", renamed here "general systemology". The contexts and modes of its elaboration, publication and implementation are discussed. The paper mostly focuses on the works of its instigator: Ludwig von Bertalanffy. However, general systemology was a collective project: the main contributions of other "systemologists", from the 1950s until the 1970s, are hence also considered. Its solidarity with the history of the Society for General Systems Research is notably discussed. A reconstruction of the systemological hermeneutics is undertaken on this basis. It finds out the potential systematic unity underlying the diversity of the contributions to this both scientific and philosophical project. Light is thus shed on the actual scope of von Bertalanffy's works.

Bertalanffy’s so-called “general system theory” (GST) and cybernetics were and are often confused: this calls for clarification. In this article, Bertalanffy’s conceptions and ideas are compared with those developed in cybernetics in order to investigate the differences and convergences. Bertalanffy was concerned with first order cybernetics. Nonetheless, his perspectivist epistemology is also relevant with regard to developments in second order cybernetics, and the latter is therefore also considered to some extent. W. Ross Ashby’s important role as mediator between GST and cybernetics is analysed. The respective basic epistemological approaches, scientific approaches and inherent world views are discussed. We underline the complementarity of cybernetic and “organismic” trends in systems research within the unitary hermeneutical framework of “general systemology”.