The European Commission, DG XII, has published a report entitled "Operational safety - Joint CEC-ESReDA seminar". The report contains the proceedings of a seminar on operational safety which was held by the European Commission and the European Safety, Reliability and Data Association (ESReDA) in Lyon, France, on 14-15 October 1993. The seminar included presentations on EU-funded research projects carried out by ESReDA members. Participants came from the leading European organizations engaged in research on operational safety as well as those concerned with the application of research results. The proceedings are divided into the three areas represented in the seminar: - Organizational issues; - System assessment; - Emergency response. Each section begins with the session chairman's report, followed by the papers, and ending with a report on the questions and discussion of the session. A summary of the closing plenary discussion is also given.