Contractual Date of Delivery to the CEC: 30-Sep-2013 Actual Date of Delivery to the CEC: 30-Sep-2013 Organisation name of lead contractor for this deliverable: ULEIC Author(s): Hernán Ponce de León,

Complex systems often exhibit unexpected faults that are difficult to handle. Such systems are desirable to be diagnos-able, i.e. faults can be automatically detected as they occur (or shortly afterwards), enabling the system to handle the fault or recover. A system is diagnosable if it is possible to detect every fault, in a finite time after they occurred, by only observing the available information from the system. Complex systems are usually built from simpler components running concurrently. We study how to infer the diagnosability property of a complex system (distributed and with mul-tiple faults) from a parallelized analysis of the diagnosability of each of its components synchronizing with fault free versions of the others. In this paper we make the following contributions: (1) we address the diagnosability problem of concurrent systems with arbitrary faults occurring freely in each component. (2) We distribute the diagnosability analysis and illustrate our approach with examples. Moreover, (3) we present a prototype tool that implements our techniques showing promising results. Note