Abstract
Among the 9 managements which PMBOK^[○!R] prescribes for project managers to practice, the customer communication management is an important management. There are so many studies on the management mentioned above that Customer Relationship Management (CRM) has been established as its methodology. On the other hand, while many literatures on PM competency for the customer communication management exist, there is none of the literature to edit as methodology. Therefore, we studied the methodology for project managers to manage the customer interaction with kinds of procedure to take and points to be aware in the information system development. In this article, we propose the "OSAKE Method" as methodology for the customer communication management in the information system development.