This book constitutes the refereed proceedings of the 8th International Conference on Theoretical Computer Science, ICTCS 2003, held in Bertinoro, Italy in October 2003. The 27 revised full papers presented together with an invited paper and abstracts of 2 invited talks were carefully reviewed and selected from 65 submissions. The papers are organized in topical sections on program design-models and analysis, algorithms and complexity, semantics and formal languages, and security and cryptography.

This volume contains the papers presented at WS-FM 2009: The 6th Inter- tional Workshop on Web Services and Formal Methods held during September 4 5, 2009 in Bologna, Italy. There were 18 submissions by authors from 12 countries. Each submission was reviewed by at least 3, and on the average 3.9, Program Committee m- bers. The committee decided to accept 10 papers. Most of the selected papers are reports on work in progress on problems related to formal aspects of Web services. This workshop also features three invited talks by Mariangiola Dezani (Sessions and Session Types: An Overview),...