Abstract
Design safety analysis tools based on qualitative simulation are an effective way of obtaining early feedback on potential problems with designs, and can typically be employed as soon as the functionality and structure of the system is known. However, they become less effective later in the design process. This paper describes how the capability and utility of design safety analysis tools can be improved through separating the types of knowledge used into layers so that the maximum amount of information can be reused as the design changes.
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