The ways in which humans interact with computers will change dramatically in the coming years. In this book, the field's leading experts preview that future, focusing on critical technical challenges and opportunities that will define Human-Computer Interaction research for years and decades to come. Editor John M. Carroll, a leader of the HCI community, has assembled essays that anticipate tomorrow's state-of-the-art -- and its implications for users, professionals, and society. These essays cover every area of research, including models, theories, and frameworks; usability engineering; user interface software and tools; HCI for collaborative applications; HCI for multimedia and hypermedia; integrating real and virtual worlds; and HCI's impact on society. Discover advanced cognitive models for evaluating user interfaces; preview the future of user interface software tools; and learn how user interfaces can support innovation. Preview tomorrow's intelligent interfaces, recommender systems, and tangible user interfaces; as well as interface solutions for digital libraries and ubiquitous computing systems. Carroll provides cogent introductions to each essay, as well as a detailed preface offering an overview of the entire field.