This volume contains papers presented at the 6th International Workshop on Persistent Object Systems, held in Tarascon, Provence, France, from 5-9 September 1994. As in previous years, the workshop addressed the issue of how to support the implementation of very long-lived systems. Among the specific topics discussed were: how to build, maintain and operate large persistent applications; how to measure and analyze existing systems in order to improve the quality of persistent software engineering; and how to present and provide a full range of object store functions, such as concurrency, transactions and recovery.