Law of Requisite Variety

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This page offers a definition and a summary of articles concerning the law of requisite variety.


"The law of Requisite Variety (LRV) can be stated as follows: a controlling system can only control a system if it can generate the requisite variety to equal the variety generated by the system it wishes to control." (Introna, 1997)

Video - In this video the law of requisite variety by Ashby and its implications for management are described. For everyone who wants a short visual introduction.

Articles on this wiki

  1. Lewis, G. J. and Stewart, N. (2003), The measurement of environmental performance: an application of Ashby's law. Syst. Res., 20: 31–52.
  2. Ashby, W.R. (1958), Requisite variety and its implications for the control of complex systems. Cybernetica, 1(2), 83-99.
  3. Introna, L.D. (1997), Management, Information and Power: A narrative of the involved manager, Macmillan, Basingstoke.