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ARID - Analysis of Risk through In-system Degradation

: Kemmann, Sören; Adler, Rasmus; Trapp, Mario

Kaiserslautern, 2011, 6 pp.
IESE-Report, 071.11/E
Reportnr.: 071.11/E
Fraunhofer IESE ()

The first and maybe most important step in the development of complex safey-critical systems is the risk analysis. The ever increasing complexity and the functional interaction of today's systems require a stricter interpretation of risks. It is not sufficient to only focus on single service failures and assess their criticality. One has to be sure that every possible system risk, consisting of possibly more than one service failure, is acceptably safe. Standards such as the ISO 26262 show their awareness for those challenges, by stating that "multifunctional degradation" should be considered as well. This burdens the risk analysis process with the challenge to consider not only the number of service failures, Nsf, but all possible combinations: 2Nsf. With traditional analysis techniques this is impossible to handle. In this paper we present ARID, a model-based approach for efficiently dealing with the 2Nsf possible effects. With this we solve not only the challenge of assessing multifunctional degradation scenarios, but we enable a way to ensure that every possible system failure effect has correct safety margins, i.e., a safe risk assessment.