Müller, J. R.; von Buxhoeveden, G.; Schnieder, E.:
Supporting the safety-case development in practice – Experiences from the European project “Integrated European Signalling System”.
EKA 2010 - Entwurf komplexer Automatisierungssysteme 11. Fachtagung , S. 143-150, Magdeburg, Mai 2010.


Keywords: Safety case, interlocking systems, Cenelec The European project called „INESS – Integrated European Signalling System“ aims at defining and developing specifications for a new generation of interoperable interlocking systems suitable to be integrated in ERTMS systems, with the objective of making the migration to ERTMS more cost-effective. The Technical University of Braunschweig is leader of the part of INESS that deals with the safety case process. The aim of this essential “workstream” is to reduce time and money for the development of the safety case in industry, i.e. operators as well as suppliers, by avoiding unnecessary or redundant procedures. In this workstream a dozen European partners have contributed to the results. One basis to achieve this goal was the collection of the practitioner’s experiences and interpretation of the norms, the time and money consuming tasks as well as proposals for the support of the safety case process in practice. This paper presents 1. the task of collecting experiences, various obstacles and fruitfull approaches through interviews on the basis of a questionnaire; 2. the formal specification of an improved safety case process, consisting of the normative process as stated in the CENELEC EN 5012x norms and additional improvement tasks to support the safety case manager and writer in industry; 3. the cost reduction potential of such a tool support; 4. and the current status of the supporting software-tool implementing the improved safety case process