Separation of Concerns for Dependable Software Design

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Executive Summary

For 'Mixed-criticality' systems that have both critical and non-critical functions, the greatest leverage on dependability may be at the design level. By designing so that each critical requirement has a small trusted base, the cost of the analysis required for a dependability case might be dramatically reduced. An implication of this approach is that conventional object-oriented design may be a liability, because it leads to 'Entanglement', and an approach based on separating services may be preferable.

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