Formal Techniques for Computer Systems and Business Processes European Performance Engineering Workshop, EPEW 2005 and International Workshop on Web Services and Formal Methods, WS-FM 2005, Versailles, France, September 1-3, 2005. Proceedings - Bravetti, Mario; Kloul, Leïla; Zavattaro, Gianluigi (Springer Berlin Heidelberg, 2005)