Abstract
In a system construction project, in terms of QCD we face difficulty to share common understanding and agree with stakeholders about the project costs. Clients and vendors are likely to face conflicts because of a gap between them: Clients want to fix the schedule and costs before clarifying their requirements; however, vendors do not want to estimate the whole project costs without clarifying the clients' requirements. There are two reasons why this happens: (1) The concept of PMBOK (the method raising the accuracy of the project costs step by step) is not still in common, and (2) Lack of clarification and common understanding of the idea that how requirement modification occurring during the project will affect the whole project schedule and costs. This thesis provides effectiveness of the project management method which shares the scale change with clients by considering of results of the actual project using this method.
