Distributed monitoring of concurrent and asynchronous systems---extended version

In this paper we study the diagnosis of distributed asynchronous systems with concurrency. Diagnosis is performed by a peer-to-peer distributed architecture of supervisors. Our approach relies on PN unfoldings and event structures, as means to manipulate trajectories of systems with concurrency. This report is an extended version of the paper with same title, which appeared as a plenary address in the Proceedings of CONCUR'2003