Safety and reliability are related but not identical. Nevertheless, it is difficult to imagine deploying a critical software product that might be safe but not reliable. Increasing software reliability or safety is a matter of focus on fault handling with the objective to avoid and/or reduce the consequences of software failures. The software fault handling techniques used to implement and verify safety and reliability comprise: fault prevention, tolerance, removal and forecasting. Fault removal techniques can be used in earlier development stages not only to support on deciding the fault prevention and/or fault tolerance mechanisms to use, but for verification and validation purposes too. Fault removal static techniques should complement the never 100% test coverage. Which techniques to use and why, are still controversial questions. This paper intends to present how static fault removal techniques can aid to verify software safety and reliability.
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