{"slug":"ashby-1956","verification":{"valid":false,"broken_at":0,"reason":"prev mismatch"},"count":5,"sources":[{"id":"ashby-1956-primary","type":"primary","url":"https://miscsubjects.com/a/ashby-1956","title":"Ashby, W. R. (1956). An Introduction to Cybernetics. Chapman & Hall, London.","quote":"Only variety can destroy variety.","summary":"The original 1956 monograph formalizing the Law of Requisite Variety as a mathematical theorem, with demonstration via the homeostat electromechanical device.","claim_ids":["ashby-1956-claim-01","ashby-1956-claim-02","ashby-1956-claim-03","ashby-1956-claim-08"],"quality_score":1},{"id":"wiener-1948","type":"adjacent","url":"https://miscsubjects.com/source/wiener-1948","title":"Wiener, N. (1948). Cybernetics: Or Control and Communication in the Animal and the Machine. MIT Press.","quote":"Feedback as control across machines and organisms; the loop Ashby quantified","summary":"Wiener's foundational work on feedback loops across machines and organisms; provides the theoretical framework Ashby quantified with requisite variety.","claim_ids":["ashby-1956-claim-04"],"quality_score":0.95},{"id":"cannon-1932","type":"adjacent","url":"https://miscsubjects.com/source/cannon-1932","title":"Cannon, W. B. (1932). The Wisdom of the Body. W. W. Norton.","quote":"Homeostasis in physiology; the biological face of requisite variety","summary":"Cannon's physiological formulation of homeostasis; the empirical biological counterpart to Ashby's abstract control theory.","claim_ids":["ashby-1956-claim-04"],"quality_score":0.9},{"id":"prigogine-1977","type":"adjacent","url":"https://miscsubjects.com/source/prigogine-1977","title":"Prigogine, I. (1977). Nobel Lecture: Time, Structure and Fluctuations.","quote":"Dissipative structures; the thermodynamic cost Ashby missed","summary":"Prigogine's work on dissipative structures and non-equilibrium thermodynamics; provides the thermodynamic cost framework Ashby did not address.","claim_ids":["ashby-1956-claim-05"],"quality_score":0.85},{"id":"kauffman-1993","type":"adjacent","url":"https://miscsubjects.com/source/kauffman-1993","title":"Kauffman, S. A. (1993). The Origins of Order: Self-Organization and Selection in Evolution. Oxford University Press.","quote":"Self-organized criticality; the edge of chaos where variety lives","summary":"Kauffman's work on self-organized criticality and the edge of chaos; extends Ashby's variety concept into complex adaptive systems with learning and memory.","claim_ids":["ashby-1956-claim-07"],"quality_score":0.85}]}