  The growing complexity of safety-relevant systems causes an increasing effort
for safety assurance. The reduction of development costs and time-to-market,
while guaranteeing safe operation, is therefore a major challenge. In order to
enable efficient safety assessment of complex architectures, we present an
approach, which combines deductive safety analyses, in form of Component Fault
Trees (CFTs), with an Error Effect Simulation (EES) for sanity checks. The
combination reduces the drawbacks of both analyses, such as the subjective
failure propagation assumptions in the CFTs or the determination of relevant
fault scenarios for the EES. Both CFTs and the EES provide a modular, reusable
and compositional safety analysis and are applicable throughout the whole
design process. They support continuous model refinement and the reuse of
conducted safety analysis and simulation models. Hence, safety goal violations
can be identified in early design stages and the reuse of conducted safety
analyses reduces the overhead for safety assessment.
