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The growing complexity of safety-relevant systems causes an increasing effortfor safety assurance. The reduction of development costs and time-to-market,while guaranteeing safe operation, is therefore a major challenge. In order toenable efficient safety assessment of complex architectures, we present anapproach, which combines deductive safety analyses, in form of Component FaultTrees (CFTs), with an Error Effect Simulation (EES) for sanity checks. Thecombination reduces the drawbacks of both analyses, such as the subjectivefailure propagation assumptions in the CFTs or the determination of relevantfault scenarios for the EES. Both CFTs and the EES provide a modular, reusableand compositional safety analysis and are applicable throughout the wholedesign process. They support continuous model refinement and the reuse ofconducted safety analysis and simulation models. Hence, safety goal violationscan be identified in early design stages and the reuse of conducted safetyanalyses reduces the overhead for safety assessment.

Verification of Component Fault Trees Using Error Effect Simulations