This book constitutes the refereed proceedings of the 9th International Conference on Modeling Techniques and Tools for Computer Performance Evaluation, held in St. Malo, France, in June 1997. The volume presents 17 revised full papers carefully selected by the program committee for the proceedings; also included is an extended abstract of an invited talk. The collection of papers presented represents state-of-the-art work in computer performance evaluation. Among the issues addressed are fully distributed systems, statistical multiplexing for high-speed networks, and implications of the concept of dependability.