The Encyclopedia of Human Computer Interaction is the most thorough and definitive source providing coverage of everything related to the field of human computer interaction (HCI). This encyclopedia covers a wide range of HCI related topics such as concepts, design, usability, evaluation, innovations, and applications of HCI in organizations around the globe. Hundreds of contributors and advisors from around the world have conferred their expertise to this publication, making this encyclopedia a single source of authoritative and contemporary research in field of human computer interaction. The Encyclopedia of Human Computer Interaction also includes coverage of real life experiences and cases of HCI and the lessons learned helping readers to learn extensively about this important field of study.