In relation to the existence of functional cycles, J.von UEXKÜLL, as early as 1928, showed the presence in systems of mechanisms able to block functional processes when they could cross a threshold of instability.
He added that the blockage is absolute in the case of a critical threshold whose crossing would provoke the systems destruction. However, when the process leads to fluctuations within acceptable limits, the mechanism merely acts as a guideline (1979, p.164).
von UEXKÜLL's concept may be generalized, considering that any function in a complex system appears to be controlled by a pyramid of hierarchical blocking mechanisms at different levels.
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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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