This work contains the invited papers presented at the ninth annual Safety-critical Systems Symposium, held in Bristol, February 2001. For some time, it has been recognised that technical issues are only one side of the safety coin. The other, often dominant feature, is active, informed and committed management. An understanding of risk, emphasis on education and the use of language, attention to learning lessons from both research and other industry sectors, and the development of the appropriate staff competences, are all aspects of safety management. The papers contained within this volume cover a broad range of subjects, but all have the common link of safety management. They present a great deal of industrial experience, as well as some recent academic research.