Originally published in 1989, this book is a distinctive work in the field of human-computer interaction (HCI). Cognitive ergonomics and HCI encompass a wide range of research and development activities in both academic and industrial environments, and this book satisfies a clear need for the dissemination of the knowledge generated by work in progress or completed. The book provides detailed reports of a number of long-term research projects, set within a framework for describing cognitive ergonomics activities and understanding their relationships. It reports in detail on substantial empirical investigations rather than being a summary of specific areas or theoretical speculations. The different contributions are integrated, and have been rigorously edited, within a framework provided by the editors and presented in the first chapter.