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The goal is to develop a definition for 'system' that could used by the full range of “system” disciplines: Systems Science, Applied Systems Science and Systems Engineering across the major system types: natural, social and engineered.
Essentially a return to first principles which might open the playing field to a broader audience yielding a better answer. a I expect that a major (and likely correct) push back on this initial proposed definition is that it is too simple. Even if true, it can be used to agree that we are discussing a 'system', even across representative from the different system disciplines, and from there determine what is unique about THIS system, so we have a sub-class. As we work through these specializations, we will be forming the Taxonomy for systems which can form the base for a set of Ontologies and associated Schemas but with broader involvement.