Developments in System Safety Engineering contains papers presented at the twenty-fifth annual Safety-critical Systems Symposium, held in Bristol, UK, in February 2017. The Symposium is for engineers, managers and academics in the field of system safety, across all industry sectors, so the papers making up this volume offer wide coverage of current safety topics, and a blend of academic research and industrial experience. They include both recent developments in the field and discussion of open issues and questions. The topics covered in this volume include: New Challenges, New Techniques, Software, Safety and Security, Analyses, Data Safety and Accidents. This book will be of interest to practitioners, managers and academics working in the safety-critical and safety-related systems areas.