1. Introduction; 2. Virtual individuals and virtual groups; 3. The shape of groups to come: Efforts to define, label, explain, and model collaborative activity; 4. Shared resources and spaces in CSCW applications: lessons from the uses of desks, tables, whiteboards, office settings, and video; 5. Cultural objects, technological dreams, and CSCW applications: Dependence, autonomy, and intellectual augmentation; 6. Privacy, anonymity, agency: applications of computer networking and the development of social analogues; 7. Toward a genre-responsive design approach for computing applications.