Fault Tree Analysis (FTA) is a widely used, valuable technique for assessing the possible causes of failure for a system. One of the most important results obtained from Fault Tree Analysis is the probability that the failure occurs, or the unavailability. There are several methods utilized to compute unavailability in FTA. These methods each have their own strengths and particular use cases where they are most advantageous. Therefore, it is helpful to have an understanding of the various fault tree calculation methods in order to obtain the best results for your needs.
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