Abstract
Recently, making design concept is becoming more and more important in designing and managing industrial products. The purpose of this study is to propose a method of aid to making design concept of industrial products. The method proposed in this paper is as follows. First, "Design values" are put in order by using portfolio analysis of Design values which clarify vague design values. Then a structure of product value is made to clear the vague design values. Cognitive structure which shows the relation between attitude, image and cognitive parts of product is one of the product value structures. Multivariate analysis or Rough set is used in those cases. After these operations, it is possible to reconstruct the product values and make design concepts.
