This book constitutes the refereed proceedings of the 9th International Symposium on Stabilization, Safety, and Security of Distributed Systems, SSS 2007, held in Paris, France, November 14-16, 2007.

The 27 regular papers presented together with the extended abstracts of 3 invited lectures were carefully reviewed and selected from 64 submissions. The papers address all aspects of self-stabilization, safety and security, recovery oriented systems and programing, from theoretical contributions, to reports of the actual experience of applying the principles of self-stabilization to static and dynamic systems.