Riding a Tiger, or Computer Supported Cooperative Work -- Personalisable Groupware: Accommodating Individual Roles and Group Differences -- Office Systems Development and Gender: Implications for Computer-Supported Co-operative Work -- CSCW and Distributed Systems: The Problem of Control -- Collaborative Activity and Technological Design: Task Coordination in London Underground Control Rooms -- The Group Facilitator: A CSCW Perspective -- Idea Management in a Shared Drawing Tool -- Panel: Formalization in CSCW -- Experiences with the DOMINO Office Procedure System -- Distributed Computing and Organisational Change Enable Concurrent Engineering -- An Analysis of Design and Collaboration in a Distributed Environment -- ClearFace: Translucent Multiuser Interface for TeamWorkStation -- PEPYS: Generating Autobiographies by Automatic Tracking -- Panel: Organizational Memory -- Boosting Connectivity in a Student Generated Collaborative Database -- A Model for Real-Time Co-operation -- Questioning Representations -- Speech Acts or Communicative Action? -- The Concept of Activity as a Basic Unit of Analysis for CSCW Research -- Being Selectively Aware with the Khronika System -- Participation Frameworks for Computer Mediated Communication -- Sound Support for Collaboration -- CSCW: Discipline or Paradigm? A Sociological Perspective -- Small Workshop Abstracts -- ECSCW'91 Directory: Authors & Committee Members