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Abstract As general software use increases its use in safety critical systems increase as well. Preventive measures are taken during every software engineering project, especially for software intended for safety critical systems. Despite all precautions taken problems still manage to find their ways into news headlines. Many problems caused by faulty software have resulted in large losses of resources, money and life. Due to reluctance to utilize software in such systems it is crucial that every program constructed is done so with precision and care. Although impossible to eliminate every potential problem; genuine effort should be put into identifying them and potential problems should be put to rest. 1. Introduction to software safety Software is being used in more systems today than ever before, given that fact it comes as no surprise that software use in safety critical systems are also increasing. When the idea of computer programs controlling dangerous machinery came about it scared people and many were reluctant to use them. Early software project