A decision support system based on fuzzy reasoning and AHP–FPP for the ecodesign of products: Application to footwear as case study

• An Ecodesign Index (EcoInd) is proposed to integrate the information coming from Environmental Risk Assessment and Ecological Footprint.
• A decision support system (DSS) integrating the criteria provided by the environmental indicators was developed based on Fuzzy Preference Programming method and fuzzy logic reasoning.
• The developed DSS is very useful to aid the ecodesign of products.
• The DSS was tested with the ecodesign of footwear as case study.

The design stage represents one of the most critic steps for product development. Here, a great number of considerations have to be borne in mind, e.g., technical, functional, aesthetic or economic criteria. More recently, the increasing concerns on environmental aspects have added complexity to the process, known as ecodesign. In this respect, a framework to integrate the criteria provided by quantitative environmental indicators has been proposed on the basis of Fuzzy Preference Programming method features and fuzzy logic reasoning. As a result, an integrated Ecodesign Index (EcoInd) is obtained. This idea enables the decision making at process and product level taking into account different indicators at a time. The ecodesign of children's footwear was taken as case study and an ecodesign tool (decision support system) that included the estimation of environmental indicators and their integration was developed. Different models of shoes were analyzed to identify the most environmentally friendly design and to test the tool. In this case, the Ecological Footprint and two Environmental Risk Assessment indicators, namely Hazard Quotient and Cancer Risk, were selected as relevant environmental indicators and they were computed from data provided by a shoes manufacturer. Then, these indicators were integrated in the ecodesign tool and the EcoInd values were appraised for the children's footwear models analyzed. According to these figures, they were ranked as Red Leather > White Leather > White Synthetic > Pink Synthetic, from best to worst.

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