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GOBI and OASIS - A concept and its realization for model-based situation descriptions compliant to ISO 26262

: Kemmann, S.

International Association for Probabilistic Safety Assessment and Management -IAPSAM-; European Safety and Reliability Association -ESRA-:
11th International Probabilistic Safety Assessment and Management Conference and the Annual European Safety and Reliability Conference, PSAM/ESREL 2012. Proceedings. Vol.6 : Helsinki, Finland, 25-29 June 2012
Red Hook, NY: Curran, 2012
ISBN: 978-1-622-76436-5
International Probabilistic Safety Assessment and Management Conference (PSAM) <11, 2012, Helsinki>
European Safety and Reliability Conference (ESREL) <2012, Helsinki>
Fraunhofer IESE ()

With the introduction of ISO 26262 the awareness for safety in automotive systems has relumed. The first step in safety engineering is the Hazard Analysis and Risk Assessment (HRA). The goal of this step is to define Safety Goals that express the risk reduction necessary. Because all following safety engineering tasks rely on HRA's results it is crucial to ensure completeness and correctness of the Safety Goals. The challenge in HRA is to investigate system failures occurring along with certain environmental conditions. Especially when we talk about the latter, the environmental conditions. It is difficult to decide on completeness of environmental conditions. In practice this becomes evident in the observation that HRAs are mostly based on creativity techniques, which produce an informal representation of the analysis information (usually an Excel sheet). SAHARA, our Systematic Approach for Hazard Analysis and Risk Assessments, addresses the challenge of formalizing HR As in general. In this paper however, we will focus on the completeness challenge of environmental information. In ISO 26262 the parameter concerning the description of operational situations and environmental conditions is called Exposure parameter. The way to more formal and therefore complete situation descriptions is a two step approach. Therefore we describe in this paper GOBI, our conceptual model of necessary HRA information and OASIS, the concrete instantiation and implementation of GOBI.