Representations of humans in virtual environments are called Avatars. This book brings together work from a variety of relevant disciplines to detail how humans interact in computer-generated environments. It contains contributions from several key people in the field, including Microsoft Researchs Virtual World Group, and presents their findings in a way that is accessible to readers who are new to the field. Coverage details Internet-based virtual worlds that have been widely used by the public as well as networked VR systems that have been primarily used in pilot studies and research.

Developments in technology have made it possible for speech output to be used in place of the more usual visual interface in both domestic and commercial devices. Speech can be used in situations where visual attention is occupied, such as when driving a car, or where a task is complex and traditional visual interfaces are not effective, such as programming a video recorder. Speech can also be employed in specialist adaptations for visually impaired people. However, the use of speech has not been universally successful, possibly because the speech interaction is poorly designed. Speech is fundamentally different from text, and a lot of the problems may arise due to simplified text-to-speech conversion. Design of Speech-based Devices considers the problems associated with speech interaction, and offers practical solutions.

The interpretive literature in the history of political thought is now vast, complex and esoteric, posing as much a barrier to the understanding of the undergraduate student as it offers assistance. This unique and innovative text provides the student with a guide through this maze of argument. Each chapter sets out the major positions and debates that surround the texts of key thinkers, analyzes major problems of interpreting them, examines the sources of disagreement, and evaluates the different interpretations in terms of their strengths, weaknesses and contributions to scholarship.