Michael Amberg, Timo Holm, Kristian Dencovski, and Mathias Maurmaier, “A Challenge Based Evaluation of Service Information Systems,” Proceedings of the 10th International Business Information Management Association (IBIMA), ISBN: 978-0-9753393-9-8, 30 June – 2 July 2008, Kuala Lumpur, Malaysia, p.247-253.