The kansei implies the product value which matches to the consumer’s feeling and needs. It has an attractive property to the consumer since it corresponds to their wants. Accordingly if the manufacturers understand the present consumer’s needs and wants and they transfer these to design domain; they will be successful in business market.
There are two pints leading success of a product development; the first point is to grasp what kind of product value; namely consumer’s kansei; they have in mind. Secondly; manufacturers should know how to realize this product value in the design domain as the product quality. The present paper is not success story as yet; on the process; but it will be an excellent case to show you what is going on the kansei/affective engineering. We also have an attempt to apply the rough sets theory which has compatibility with the kansei engineering to find design specification.
Keywords: Kansei Engineering; a ball pen design; Rough Set Model; Upper Approximation Decision Rule