This book constitutes the refereed proceedings of the 7th IFIP WG 6.1 International Conference on Formal Methods for Open Object-Based Distributed Systems, FMOODS 2005, held in Athens, Greece on June 15-17, 2005. The FMOODS conference was held as a joint event in federation with the 5th IFIP WG 6.1 International Conference on Distributed Applications and Interoperable Systems (DAIS 2005).

The 19 revised full papers presented together with an invited paper were carefully reviewed and selected from 91 submissions. The papers are organized in topical sections on models and calculi, UML, security, composition and verification, analysis of java programs, Web services, specification and verification.