Abstract
This paper describes the case of company A where it was caught what the SE who is the key person of project would realize on the wok fields using SSM (Soft Systems Methodology (P. Checkland1981)), in the process of an improvement and reform of the project management system by PMO, and it is shown that the process of SSM is effective in grasp the change of the problem situation accompanying introduction of the project management system based on PMBOK.