never-endingness, activity-orientedness, continuous design, realism are some of the pillars of this approach; enabling to deal with the complex, heterogeneous, multi-user and mul- purpose constructions which AE designers have to face. The book illustrates how these principles enabled them to construct robust, ef- cient, and user-friendly Augmented Environments in spite of the many challenges to make these operational. We hope their experience will help the reader. Primary audience: Academics, Students and Professionals involved in the CHI, CSCW, Ubicomp, Cooperative Building communities. Computer Scientists int- ested by end-users and applications, Social Scientists operating in the IT domain, IT & Organization Consultants. Secondary audience: Developers of office and conferencing applications or middleware, Architects of office buildings, Space Planners, Designers; Facility Managers; IT, furniture & building Business Communities.