International audienceThe practice of eco-design requires relating traditional design criteria to new environmental criteria. So far, few studies have investigated the nature and singularities of eco-design. This article provides some elements of response based upon the redesign of a consumer product (disposable razor). The study was conducted by three groups of experienced eco-designers using existing eco-design tools (SIMAPRO, ECOFAIRE, ECODESIGN PILOT). A protocol analysis with a three-level coding of transactions was carried out for this purpose. Two main findings are reported: (1) environmental assessment, solution finding and strategy definition are the activities which differentiate eco-design from design; (2) environmental initial assessment and strategy definition are more heavily influenced by eco-designers’ expertise than support from tools.Highlights► This study investigates the nature and singularities of eco-design compared to traditional design. ► A protocol analysis based on the observation of three experienced eco-designers' teams is conducted. ► Each team implements a different existing eco-design tool to redesign the same consumer product. ► Environmental assessment, solution finding and strategy definition appear to be specific to eco-design practice. ► Initial environmental assessment and strategy definition are heavily influenced by eco-designers' expertise

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