Exploring the Impact of Different Cost Heuristics in the Allocation of Safety Integrity Levels

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 2014

Autores

Azevedo, LS (Autor) Outra; Parker, D (Autor) Outra; Papadopoulos, Y (Autor) Outra; Walker, M (Autor) Outra; Sorokos, I (Autor) Outra; Rui Esteves Araújo (Autor) FEUP

Ata de Conferência Internacional

Título: MODEL-BASED SAFETY AND ASSESSMENT, IMBSA 2014

Páginas: 70-81

4th International Symposium on Model-Based Safety and Assessment (IMBSA)

Munich, GERMANY, OCT 27-29, 2014

Indexação

ISI Web of Knowledge - 3 Citações

Scopus - 6 Citações

Outras Informações

ID Authenticus: P-00G-1N5

Abstract (EN): Contemporary safety standards prescribe processes in which system safety requirements, captured early and expressed in the form of Safety Integrity Levels (SILs), are iteratively allocated to architectural elements. Different SILs reflect different requirements stringencies and consequently different development costs. Therefore, the allocation of safety requirements is not a simple problem of applying an allocation "algebra" as treated by most standards; it is a complex optimisation problem, one of finding a strategy that minimises cost whilst meeting safety requirements. One difficulty is the lack of a commonly agreed heuristic for how costs increase between SILs. In this paper, we define this important problem; then we take the example of an automotive system and using an automated approach show that different cost heuristics lead to different optimal SIL allocations. Without automation it would have been impossible to explore the vast space of allocations and to discuss the subtleties involved in this problem.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12