Operations Management studies point out that technical and strategical choices on product design, production process and scheduling are the prerequisites to gain efficiency and efficacy in operational activities. Such choices aimed at gaining both actions repetitiveness and response flexibility, if properly used, can lead to efficiency and efficacy that are “effectiveness”. In this paper, first the relevant variables of the problem are defined and hierarchically ordered in terms of determinants and results. Then it is shown how these variables, all linguistic, are well definable through fuzzy sets and measurable through fuzzy inference based on Mamdani rules. The obtained fuzzy model can be used to verify the coherence in the choices to overcome the trade-off efficiency/efficacy and to point out the potentiality to gain effectiveness.
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