A balanced satisfaction design of two performances in each of technology, economy and environment in product design (total 6 performances) using set-based design concept based on performance satisfaction is implemented. Each interval solution of plural design variables that simultaneously satisfies the plural performances is achieved. As an application example, a model of vehicle door structure is used to reveal how set-based design method can be applied. As a result, the interval solutions of

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... erformances and design variables for the design model are obtained. The effectiveness of the set-based design method is demonstrated. This method is a general design method that can be also applied to problems with conflict and heterogeneity, and then, it can be an approach to solve the other environmental design problems of real products with such complex characteristics. Abstract A balanced satisfaction design of two performances in each of technology, economy and environment in product design (total 6 performances) using set-based design concept based on performance satisfaction is implemented. Each interval solution of plural design variables that simultaneously satisfies the plural performances is achieved. As an application example, a model of vehicle door structure is used to reveal how set-based design method can be applied. As a result, the interval solutions of performances and design variables for the design model are obtained. The effectiveness of the set-based design method is demonstrated. This method is a general design method that can be also applied to problems with conflict and heterogeneity, and then, it can be an approach to solve the other environmental design problems of real products with such complex characteristics.