As currently used, systems theory is lacking a universally agreed upon definition. The purpose of this paper is to offer a resolution by articulating a formal definition of systems theory. This definition is presented as a unified group of specific propositions which are brought together by way of an axiom set to form a system construct: systems theory. This construct affords systems practitioners and theoreticians with a prescriptive set of axioms by which a system must operate; conversely, any set of entities identified as a system may be characterized by this set of axioms. Given its multidisciplinary theoretical foundation and discipline-agnostic framework, systems theory, as it is presented here, is posited as a general approach to understanding system behavior.
The broad set of propositions identified in systems literature (circa 1900-2000s) provides an adequate, largely comprehensive subset of the complete set of all systems theory propositions. Discoverers' induction can then be applied to integrate common ideas among propositions in order to produce a set of generalised laws (axioms). A proposal for a systems theory construct resting on an axiomatic set supported by unified systems theory propositions was presented by Adams et al. (2014). This paper refines the work of Adams et al. using discoverer's induction and further describes the axioms provided and their role in complex systems.
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