Abstract
Public Administration Department, NTT DATA Corporation has been conducting Software Process Improvement (SPI) on the whole organization. As the main part of our own SPI activities, we proposed and performed the review of project plans. In this activity, the senior Project Managers (PMs), who are certified in the company PM certification system, review the plan of a new or renewal project which may have potentially high risks in order to decrease those risks and to prevent problems. This activity is characterized by that the senior PMs, who have experienced a lot of projects, engage in not only validating the project plan but also sharing their knowledge and extensive experience with the project members by giving some practical advices to utilize them effectively. According to the result of questionnaire targeting reviewers and project members who have participated in reviews so far, most of them appreciated the effectiveness of the review.