Safety Case: Structure and Role

Safety can be defined as a state in which the level of risk is acceptable for the user. The risk is an expression of the possibility of a mishap in terms of hazard severity and hazard probability. The aim of constructing safety is to prove that the system possesses the highest safety integrity level. The Safety Case forms the main proof that the system complies with the safety requirements. This paper gives an assessor point of view for the Safety Case structure and role. It presents the main properties that a Safety Case must have.