Abstract
In the system development projects, there are various problems when we go through the analysis that actually uses the data though it is assumed that a quantitative project evaluation is preferable. Especially, the result of analysis is different because of viewpoint and skill of the analyst. When the index value as the data arranged in the past and the data in the project of the present progressive, it is necessary to evaluate the project with considering the difference of various preconditions. We consider that those evaluation methods have been depend on the individual's mental model. In this paper, the mechanism that understands and monitors the state of the project to the quantitative in the project executing phase is presented. We propose to employ the model substitute for the items that is difficult to acquire the data. A better decision making is supported by presenting the scenario that becomes the indicator of the performance evaluation of the team based on the organization power model.