Posts Tagged with "ASIL decomposition"

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posted by sakurai on August 21, 2020 #299



3 Misinterpretations of “ASIL” decomposition
This incorrect terminology is unfortunately associated with a great deal of misunderstanding about the purpose and application of the technique. In particular, it is often assumed that:

3 「ASIL」分解の誤解


• ASIL decomposition is frequently misinterpreted as an objective; in other words, a frequently encountered (and incorrect) question is “There is an ASIL D safety goal; now how can it be decomposed into ASIL B elements?” It is not valid to create an element out of sub-elements with lower ASIL values through such a “building block” approach without considering the independence of the redundant elements and their associated safety requirements (i.e. without considering the suitability of the architecture to support this).

• ASIL分解は、しばしば目的として誤解されます。例えば、頻繁に遭遇する(そして不正確な)質問は、「ASIL Dの安全目標がありますが、それをどのようにASIL Bエレメントに分解できますか?」冗長エレメントの独立性とそれに関連する安全要件を考慮せずに(すなわち、これをサポートするためのアーキテクチャの適合性を考慮せずに)、このような「ビルディングブロック」アプローチによって、より低いASIL値を持つサブエレメントからエレメントを作成することは有効ではありません。


$\dagger$Ward, D. D., & Crozier, S. E. (2012). The uses and abuses of ASIL decomposition in ISO 26262. 7th IET International Conference on System Safety, Incorporating the Cyber Security Conference 2012.

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