Exception handling is one of the popular means used for improving dependability and supporting recovery in the ServiceOriented Architecture (SOA). This practical experience paper presents the results of error and fault injection into Web Services. We summarize our experiments with the SOA-specific exception handling features provided by the two development kits: the Sun Microsystems JAX-RPC and the IBM WebSphere Software Developer Kit for Web Services. The main focus of the paper is on analyzing exception propagation and performance as the major factors affecting fault tolerance (in, particular, error handling, and fault diagnosis) in Web Services. Categories and Subject Descriptors C2.4 [Computer-Communication Networks]: Distributed Systems ? Distributed applications D.2.2 [Software Engineering]: Design Tools and Techniques General Terms Measurement, Performance, Design, Reliability, Experimentation, Languages Keywords Service-Oriented Architecture, dependability benchmarking, robust...