This volume presents the results of a joint National Science Foundation and European Commission Workshop which was set up to identify the future key strategic research directions in the areas of human-centred interaction, online communities and virtual environments. A research agenda is proposed for each area. There is an urgent need to make interaction more centred around human needs and capabilities, and to consider the human environment in virtual environments and in other contextual information-processing activities. The overall goal is to make users more effective in their information or communication tasks by reducing learning times, speeding up performance, lowering error rates, facilitating retention, and increasing subjective satisfaction. Online communities is an area of rapid and dynamic growth with new kinds of interaction, behaviours, communication, and relationship to the world of users and information. Guidelines for basic user interface design need to be extended to accommodate these new technologies and interfaces to users. Fruitful lines of research investigation in all these areas are set out in this book.

Rae Earnshawand John A. Vince --_. . _----- 1 Introduction The USPresident's Information Technology Advisory Committee (PITAC)recently advised the US Senate of the strategic importance of investing in IT for the 21st century, particularlyin the areas of software,human-computer interaction, scalable information infrastructure, high-end computing and socioeconomic issues [1]. Research frontiers ofhuman-computer interaction include the desire that interac tion be more centered around human needs and capabilities, and that the human environment be considered in virtual environments and in other contextual infor mation-processing activities. The overall goal is to make users more effective in their information or communication tasks by reducing learning times, speeding performance, lowering error rates, facilitating retention and increasing subjective satisfaction. Improved designs can dramatically increase effectiveness for users, who range from novices to experts and who have diverse cultures with varying educational backgrounds. Their lives could be made more satisfying, their work safer, their learning easier and their health better.

"Computer Graphics: Principles and Practice, Third Edition, " remains the most authoritative introduction to the field. The first edition, the original "Foley and van Dam," helped to define computer graphics and how it could be taught. The second edition became an even more comprehensive resource for practitioners and students alike. This third edition has been completely rewritten to provide detailed and up-to-date coverage of key concepts, algorithms, technologies, and applications. The authors explain the principles, as well as the mathematics, underlying computer graphics-knowledge that is essential for successful work both now and in the future. Early chapters show how to create 2D and 3D pictures right away, supporting experimentation. Later chapters, covering a broad range of topics, demonstrate more sophisticated approaches. Sections on current computer graphics practice show how to apply given principles in common situations, such as how to approximate an ideal solution on available hardware, or how to represent a data structure more efficiently. Topics are reinforced by exercises, program-ming problems, and hands-on projects. This revised edition features

• New coverage of the rendering equation, GPU architecture considerations, and importance- sampling in physically based rendering
• An emphasis on modern approaches, as in a new chapter on probability theory for use in Monte-Carlo rendering
• Implementations of GPU shaders, software rendering, and graphics-intensive 3D interfaces
• 3D real-time graphics platforms-their design goals and trade-offs-including new mobile and browser platforms
• Programming and debugging approaches unique to graphics development