R. ROSEN distinguishes two kinds of system descriptions: external and internal (see hereafter).
According to him, the external description is the "black-box" description. He states: "In this situation we make no attempt to identify a set of variables for the system. Rather we have at our disposal a family of perturbations which we can apply to the system, variously called forcings, or inputs, and one or more observabies which we use to index the effect of applying a particular forcing or input to the system. Such system observables are generally called system outputs or responses" (1972, p.51).
This kind of description allows for a better understanding of the relevant environment of the system and its impacts on the same, but does not easily enlightens the autopoietic characteristics of the same.
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Bertalanffy Center for the Study of Systems Science (2020). Title of the entry. In Charles François (Ed.), International Encyclopedia of Systems and Cybernetics (2). Retrieved from www.systemspedia.org/[full/url]
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