This study present the method to cope with the limitations of the existing study that has uniformly been customizing the methodology by only project`s complexity. We show how the applied model(ODW) is implemented in PMS using knowledgebase and modelbase which are designed for a scope management algorithm. An ODW model is used for implementation of a WBS identification module and regression model is used for measuring project`s complexity. Scope management algorithm is simulated in MS-Excel for estimating its effectiveness and the interrelationship among the knowledgebase, modelbase and database is derived.