This work presents the latest world-wide results in theory and practice of formal techniques for networked and distributed systems. Its theme is addressed by specialized papers in the following areas: formal methods in software development, process algebra, timed automata, theories and applications of verification, distributed systems testing, test sequence derivation. In addition, the last part of the book contains special contributions by leading researchers in the above areas to add breadth and give more perspectives to the results. This volume contains the selected proceedings of the International Conference on Formal Techniques for Networked and Distributed Systems (FORTE 2001), which was sponsored by the International Federation for Information Processing (IFIP) and held in Cheju Island, Korea in August 2001. FORTE 2001 combines two prestigious conferences, FORTE (Formal Description Techniques for Distributed Systems and Communication Protocols) and PSTV (Protocol Specification Testing and Verification), and has more than 20 years of history.