Derivation of Failure Rates and Probability of Failures for the International Space Station Probabilistic Risk Assessment study

National Aeronautics and Space Administration’s (NASA) International Space Station (ISS) Program uses Probabilistic Risk Assessment (PRA) as part of its Continuous Risk Management Process. It is used as a decision and management support tool to not only quantify risk for specific conditions, but more importantly comparing different operational and management options to determine the lowest risk option and provide rationale for management decisions.