The main goal of the COOP conferences is to contribute to the solution of problems related to the design of cooperative systems, and to the integration of these systems in organizational settings. The main assumption behind the COOP conferences is that cooperative design requires a deep understanding of cooperative work in groups and organizations, involving both artifacts and social practices. The COOP 2002 conference is mainly devoted to the following issues: the gap between 'virtual' and 'material' artifacts in human collaboration; collaboration among mobile actors; the WWW as a platform for cooperative systems and changing practices and organizations in the wake of the cooperative systems.