In this paper, we quantitatively analyze the efficiency of the Model-Based Review (MBR) method in an actual soft- ware design from the two points of view; one is cost and the other is reviewability. The MBR method is a modeling procedure for the purpose of reviewing preliminary design specifications of web-based applications. We previously have collected process data in applying both of the MBR method and an ordinary review to a preliminary design of a de- veloping web-based library system. Analyzing the collected process data, we quantitatively compare the efficiency of the MBR method and that of the ordinary review. As a result of this comparative analysis, we show that the MBR method is superior to the ordinary review in terms of not only re- viewability but also cost in the actual software design.