The evaluation and selection of a sustainable modular supplier is a strategic decision towards sustainability of manufacturing. However, few related studies have been conducted, particularly in the modular production field. In this paper, a fuzzy evaluation method is used to evaluate sustainable modular suppliers. Different from previous studies, in designing the index system of the fuzzy evaluation method, this study introduces an organizational identity perspective. What is more, an empirical study based on a formative model is conducted to design the index system. Both measures ensure the appropriateness of the index system. The stability of the fuzzy evaluation method is also discussed. By introducing a dispersion degree and discussing the different circumstances of subjective judgment errors, the stability analysis helps us to better understand the reliability of the results. Lastly, this study applies this method and the index system to a practical case. The results show that the fuzzy evaluation method is effective and can be used to evaluate sustainable modular suppliers.
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