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To be considered compelling an assurance case should address its potential deficits, possibly with the use of a confidence argument. Assurance argument and confidence argument should be clearly separated and consistent at the same time. We propose a way of their integration with the use of an element representing rationale for each argumentation strategy. The rationale integrates confidence argument...
Common definitions of “safety case” emphasize that evidence is the basis of a safety argument, yet few widely referenced works explicitly define “evidence”. Their examples suggest that similar things can be regarded as evidence. But the category evidence seems to contain (1) processes for finding things out, (2) information resulting from such processes, and (3) relevant documents. Moreover, any item...
The use of Software of Unknown Provenance (SOUP) in the development of modern information systems has become widespread and is difficult to avoid. Unfortunately, important properties of the software, such as critical security properties, cannot be assured with SOUP making the use of SOUP problematic. In this paper we summarize Kevlar, a comprehensive approach to enhancing the security of SOUP. Kevlar...
Quantitative methods are usually preferred in safety assessment, but, frequently, necessary probabilities cannot be determined accurately. As a result, expert judgment plays a significant role in safety arguments and system deployment decisions. Trust in expert judgment is based on the assumption that the expert's experience, knowledge, and training will enable the expert to make a suitable decision...
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