Abstract
The logical connectives in the conceptual models of Soft Systems Methodology are limited to relations of ‘necessity’. This is not enough to achieve a correspondence with states of affairs in the physical world. In order to attain this correspondence connectives representing ‘sufficiency’ must be included. When this is done a logical account of efficiency is possible. This defines efficiency as the arbiter between two or more sufficient but unnecessary conditions of a desired effect.
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Gregory, F. Cause, Effect, Efficiency and Soft Systems Models. J Oper Res Soc 44, 333–344 (1993). https://doi.org/10.1057/jors.1993.63
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DOI: https://doi.org/10.1057/jors.1993.63