Deriving safety cases for hierarchical structure in model-based development

Basir, Nurlida, Denney, Ewen and Fischer, Bernd (2010) Deriving safety cases for hierarchical structure in model-based development. In, 29th International Conference on Computer Safety, Reliability and Security, Vienna, Austria, 14 - 17 Sep 2010. Springer , 68-81. (doi:10.1007/978-3-642-15651-9_6).


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Model-based development and automated code generation are increasingly used for actual production code, in particular in mathematical and engineering domains. However, since code generators are typically not qualified, there is no guarantee that their output satisfies the system requirements, or is even safe. Here we present an approach to systematically derive safety cases that argue along the hierarchical structure in model-based development. The safety cases are constructed mechanically using a formal analysis, based on automated theorem proving, of the automatically generated code. The analysis recovers the model structure and component hierarchy from the code, providing independent assurance of both code and model. It identifies how the given system safety requirements are broken down into component requirements, and where they are ultimately established, thus establishing a hierarchy of requirements that is aligned with the hierarchical model structure. The derived safety cases reflect the results of the analysis, and provide a high-level argument that traces the requirements on the model via the inferred model structure to the code. We illustrate our approach on flight code generated from hierarchical Simulink models by Real-Time Workshop

Item Type: Conference or Workshop Item (Paper)
Digital Object Identifier (DOI): doi:10.1007/978-3-642-15651-9_6
ISBNs: 9783642156502 (hardback)
9783642156519 (electronic)
Keywords: model-based software development, automated code generation, formal proofs, formal analysis, safety case, automated theorem proving
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions : Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Electronic & Software Systems
ePrint ID: 271426
Accepted Date and Publication Date:
September 2010Made publicly available
Date Deposited: 20 Jul 2010 10:30
Last Modified: 31 Mar 2016 14:18
Further Information:Google Scholar

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