International Journal of Electronics and Electrical Engineering (IJEEE)
With the increasing complexity and size of software system, the difficulty of managing software quality is growing rapidly. How to ensure software quality has always been the important issue that needs to be solved. This paper builds a software quality predicting model for solving this issue. In order to realize this, it establishes OOPNs (Object-Oriented Petri-Nets) model to describe software development process which are organized as waterfall order. The stages are divided into three parts: previous stages, current stage and following stages. For the previous stages, the defects number could obtained by respective review activities.