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A fuzzy decision model is proposed to select an optimum design from various design alternatives. At the first, the evaluated objectives are arranged in a hierarchical structure with several levels. Secondly the relative contribution of each criterion to the overall value is quantified based on AHP method. Owing to vague concepts of the people' feeling, the information of the degrees of satisfaction of each criteria perceptions of people on the design ideas are quantified with the membership functions of a fuzzy set. Afterward, a weighted generalized mean method is used to calculate the fuzzy probability level by level from the lowest-level objectives. After the fuzzy expected values of the top-level objectives are calculated, they are then used to make a decision quantitatively on selecting the optimal design alternative. Although a cash register is taken as an example in this study, this method can also be used on other products.