Abstract
It is necessary to understand design subjects correctly to develop products with attractiveness and problem solving for users. It is not easy to lead to a big improvement even if the problem on HCI of the product is individually solved. Additionally, the solutions will conflict together. It is necessary to grasp the problem as not individual but group. And also it is necessary to discover wide subject scope. The present study pays attention to the relativity of problems and situations in which the problems are caused. Situation key words are extracted from the problem situation. Next, the relations between situation key words are clarified by Hayashi's quantification method-3 and cluster analysis. And, the result of case experiment is described. In discusses, the content relates the fact concerning the number of situation key word and the number of the product which is surveyed.
