The study examines communication and learning in a computer-supported cooperative work (CSCW) environment. In the project, learning in communities of practice, as defined by Lave and Wenger, is researched in the unfolding activities of a computer-mediated research group meeting. The idea of situated learning is compared with the ethnomethodological and interaction analytic ideas of situated action. This means that concepts like legitimacy of participation can be analyzed from videoed empirical data, with the starting point that legitimacy of participation and any other phenomenon connected to situated learning have to be achieved during a specific encounter. (Pirkko Raudaskoski)