Ubiquitous user modeling differs from generic user modeling by three additional concepts:
ongoing modeling ongoing sharing and ongoing exploitation. Systems that share their user
models will improve the coverage the level of detail and the reliability of the integrated
user models and thus allow better functions of adaptation. Ubiquitous user modeling implies new
challenges of interchangeability scalability scrutability and privacy. This volume presents
results of a series of workshops on the topic of Ubiquitous User Modeling since 2003 and
additional workshops at various other conferences e.g. on User Modeling and Adaptive Hypermedia
in the last four years. The 8 revised full papers presented were carefully reviewed and
selected from the best lectures given at the workshops and were significantly extended to be
included in the book.
