This research conducted within an energy sector company brings together both information systems and knowledge organization (KO). Our proposal, based on a case study, analyzes the ‘interface’ question in a firm through the building of an information system dedicated to the organization of knowledge within a community of practice. Through this case, we will develop an approach related to KO/technologies and by considering the discipline as a way of having a common understanding in a community of practice. Moreover, by sharing the same knowledge, it is also a way to render communication efficient between the member of this community.