Abstract
The author has been analyzing the evaluation method to select the substitutable machine parts material by seizing the aplication trends of the processings on the interposed scales of the factors of materials. The factors of materials are composed of the interval scales, and the qualitative information . Here, the author showed the categorize technique for the interval scale, which applied the tranmsitted inforamtion. However there is no way to realize the difference among the material on the qualitative factors which are given by descriptions or drawings. This paper dealt with the technique to classify the qualitative factors.
