The good regulator theorem, developed by Roger C. Conant and W. Ross Ashby, posits that every effective regulator of a system must be a model of that system. This concept is a fundamental principle in cybernetics, emphasizing the need for regulators to contain or access models of the systems they control. The theorem applies to regulating and self-regulating systems and highlights the necessity of considering all variables for accurate regulation. Despite being widely cited, the theorem's formal proof has faced criticism for not fully supporting its claims.
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