Formal Safety Assessment
The use of qualitative methods has a long history within the maritime industry. More recently, however, the use of quantitative methods has opened up an opportunity to compare different concepts and safety measures on a common scale. In the previous chapters several techniques, both quantitative and qualitative, have been described for analyses of event probabilities and consequences. In addition to these techniques, the costbenefit analysis (CBA) described in the previous chapter makes it possible to compare and implement the results of the risk analysis in terms of costs. Hence, by applying a sequence of all these methods, decisions can be made about which concepts to choose and which safety measures to implement based on a simple assessment of the costs involved. The validity of comparing different concepts or safety measures on a common scale is, however, not only related to the scale itself but also to the analysis process. Different approaches to the problem and different assessment of details may contribute to different results. As a result of this situation a need for standardization and generalization of the analysis approach/ process was brought to the surface. One proposed standard analysis approach that has gained wide recognition is the so-called Formal Safety Assessment (FSA) approach.