Abstract: The valuation of a production system's effectiveness requires a more appropriate decision-making indicator. The absence of this indicator constitutes a disability to give the managers a method to attain performance at the level of their services. In this article, we propose a model based on fuzzy logic that assess system effectiveness of manufacturing production. As a result, this model guides the operational decision-makers (maintenance, production, quality) to make the best decision and to have a more global vision of the production system's performance. A case study was done within an industrial firm to test the offered model. Results show that the model is more realistic, robust and has better stocks compared to the classical method.

Key words: effectiveness, indicator of performance, fuzzy logic, system of production