Methodology/approach: Rough set model is a promising method to analyze the interaction effects; important information for kansei product design which traditional statistical analysis was difficult to find out. We applied the proposed methodology to kansei product development project of car floor carpet for new car design and compared it with traditional kansei engineering methodology. Based on the proposed methodology; we clarified the patterns of customersâ€™ needs to car floor carpet and identified design element pattern rules to realize customersâ€™ needs.
Findings: Rough set based approach was very useful in that it is able to clarify customersâ€™ latent needs as a combination of principal component elements and relates them to product specification considering its significant interaction effects. Rough set model could clarify customersâ€™ latent needs; and then find new design elements interacting the design elements; which were not found out by traditional statistical analysis. At the present research stage; this paper suggests that it is beneficial for product designer/engineer to use rough set model; statistical analysis and his/her expert knowledge.
Research limitation/implication: Rough set based approach to kansei engineering provides more information on customersâ€™ needs about product and product design specification. Moreover; it enables a consistent analysis from the identification of customersâ€™ needs to design specifications fitted to customers needs. The proposed methodology provides a useful procedure for product designer/engineer to develop â€ścustomer-oriented productâ€ť.
Originality/value: This paper challenges traditional kansei engineering methodology and offers a new rough set based methodology for kansei engineering. It was shown that the proposed methodology was more useful in the practical kansei product design than the existing methodology; especially in the identification of customersâ€™ latent needs and the clarification of interaction effects between design elements.
Keywords: Customersâ€™ needs; kansei product design; rough set based kansei engineering methodology