Abstract
This article proposes how to evaluate the design quality focusing on the quantified environment and characteristics of the project .The quality evaluation method in the lower process of software development is being established based on the achievement and experience from the past projects. However, in order to provide systems of better quality at low cost, it is necessary to ensure the quality in the upper process. However, it is difficult to evaluate the quality properly by simply applying the quality evaluation method established by fault detection test in the lower process to the upper process, because there are such factors as relationship with the client, skill of project members, and so on to affect the circumstance of project in the upper process, in addition to data credibility concern There are less such factors in the lower process of the project.
