Our society conceives the learning process, in general, through two distinct modes: the cognitive perspective considers that learning is done in the mind of the individuals; the social perspective of learning considers that the process of knowledge results from social practices, through an active participation of individuals – it is in this perspective that is situated the concept of Communities of Practice (LAVE; WENGER, 1991). From the interest in researching the process of learning in Communities of Practice, the organizational environment in which the Junior Enterprise is situated seemed an adequate space for this research. Based on French experience, Junior Enterprise are managed exclusively by graduate students, who, working on the elaboration and execution of projects for small and medium companies, ha the opportunity to develop themselves in a personal as well as in a professional level, in an independent way, but still under teacher’s orientation. To reach the proposed goal, it was done a qualitative research, based in a case study, in which data was collected through interviews with thirteen members of the Junior Enterprise PUC-Rio, in the months of November and December 2013. The content’s analysis of the interviews resulted in five categories of analysis: Legitimated Access to Practices; Organizational Ambience; Mutual Engagement; Joint Enterprise and Shared Repertoire. As a conclusion, this work suggests, based on the perception of the interviewed members, that the JC PUC-Rio is a Community of Practice, as all indicators of formation proposed by Wenger (1998) were identified in the research.