"An internal variable of a system which is under the control of a decider subsystem" (B. WALLISER, 1977, p.129).
WALLISER distinguishes two classes of command variables:
Control variable: A command variable with continuous effect in time. This is practically equivalent to a regulator.
Decision variable: A command variable operating discontinuously in time. This type corresponds to more or less frequent direct interventions of the decider, who may for example modify the calibration of a regulator.
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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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