This work was done to study employees' recognition about various factors to influence the operation efficiency of materialmanagement-information-system(MMIS). The results were as follows : First, it was investigated in a technical point of view that factors to influence tangible effectiveness include the improvement of data and information quality, efficiency of inventory management and formality of the reschedule management system. In a point of management view, the role of a top manager was the most important factor. Secondly, various factors such as simplicity of the management system, the resistance of change, and the encouragement of user's participation were estimated to influence intangible effectiveness in a organization view. Consequently, it was shown in the present study that the improvement of the operation efficiency of the MMIS requires the development of a model which can interconnect various information systems effectively.