| 单词 | requisite variety |
| 释义 | > as lemmasrequisite variety requisite variety n. (in cybernetics) the variety or flexibility of response necessary in a system for it to be able to control another system in which variety exists.The law of requisite variety states that the number of different possible states of the controlling system must be equal to or greater than the number of possible states of the controlled system. ΘΚΠ the world > relative properties > relationship > variety > [noun] > requisite variety requisite variety1956 1956 W. R. Ashby Introd. Cybernetics xi. 207 This is the law of Requisite Variety. To put it more picturesquely: only variety in R can force down the variety due to D; only variety can destroy variety. 1966 S. Beer Decision & Control xii. 281 However many interacting sub-systems of preys and predators..are invoked, it is..evident that the balance of animal populations would be grossly upset very rapidly unless the law of requisite variety held in general throughout nature. 2005 D. McKie & D. Munshi Reconfiguring Publ. Relations iii. 49 Providing an example of requisite variety, Weick..says that if a photographer has to photograph 20 subjects at different distances from his camera, he has to have at least 20 distinct settings to bring all the negatives to a uniform density and sharpness. < as lemmas |
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