关键词: 粗数, 约简, 需求分析

Abstract: To analyze customer requirements more effectively and express customers' perception more thoroughly, the method of rough number was improved and redefined with analysis of current approaches in determining weight of customer requirements. Both concepts of attribute rough number and object rough number were determined, and the new definition of rough number was compared to the old one. The demand items was simplified by setting lower limit threshold and rough boundary threshold of rough number. Furthermore, the principle of rough number's interval weight converted to single value weight was proposed. With the case study of automatic washing machine's improvement, the method and the relevant principles of rough number were verified. The reductions of improved method were realized and more closed to customers' perception with comparing to the weights obtained by average directly.

Key words: rough number, reduction, requirement analyzing, product development