Fault Tree Analysis and Event Tree Analysis are versatile methods for dealing with probabilistic risk, reliability and availability issues. Although fault tree analysis was developed in the 1960s for hardware systems, it is an adaptable logic-based technique that has been applied to combined hardware and software systems. SoHaR was a pioneer in the application of fault trees to software. We have since applied the technique to combined hardware and software systems in military command and control systems, air traffic control systems, and flight critical digital aircraft systems.


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