Abstract
There is a limit to what a project manager experiences, and he/she does not have opportunity of sharing the experiences with other project managers than expected. We have participated in the task for sharing PM knowledge which is formed as a task in an in-house PM community. Although the task was driven by voluntary members, it produced not only good results such as book review of PM related books, introduction of PM case studies, and holding both a lecture meeting and round-table meetings, but also improvement of own PM skills and human-networking. In this paper, these activities of the task are introduced and the background of such effective activity driven in the task is discussed.