Abstract:

The research of current software requirements, many hotspot are widely noted, for example: improving the completeness of requirements, setting the priority of requirements and eliminating ambiguity the requirements, etc., which is requirements optimization in essence. In this paper, a method of prioritizing requirements based on the combination of Interpretative Structural Model (ISM) and Analytical Hierarchy Process (AHP) is proposed, called Structural Analytical Hierarchy Process (SAHP). First, the hierarchical model of software requirements is built with ISM. Next, the requirements of top level of the model were prioritize by analytical hierarchy process. Next，the case analysis is given, and the strengths and weaknesses of AHP and the method are compared. The results show that SAHP is better than AHP as s whole. Final, this method is distinguished with the schedule and cost analysis if the schedule and cost of project is rational, and can reduce the failure probability of the project.