Abstract
A lot of software development vendors recognize the importance of quantitative project management for QCD(Quality, Cost, Delivery) and practice it. However, users(purchasers) do not pay much attention to project management although vendors report project progress and product quality. This paper proposes framework of cooperative project management between users and vendors, and also shows the procedure of contructing project management process based on PMBOK and CMMI, clarifying activities and responsibility of both users and vendors. Moreover, we present some case studies of quantitative project management processes, using the proposed framework for real industrial projects. The goals of case studies are "requirement and requirement change management" and "understanding specification for assignment to external companies" based on the analysis of legal issues and interviews to developers and managers.