Diagnosis [Tracking down fault] Diagnosis [Tracking down fault] 
Now that "MOV-25-A" is no longer a likely failure cause, "CV-46-A" becomes the most likely failure cause in this leg of the system. However, a failure of both branches of the pump train system is becoming more likely. It is easy to see how we could continue this process until we found all of the failure causes.
In this example, we have seen how Graphical-Belief is a powerful tool for exploring both real and hypothetical scenarios. It not only answers simple questions, like "What is the failure probability of the system?" but complex questions like "What is the failure probability of the system given that `Pump-A' has failed?" This ability to answer complex questions can be used in complex tasks such as diagnosing failures and establishing policies for what to do in exceptional situations.
Sensitivity Analysis. Continue with this
example and explore the implication of critical assumptions on the
system failure rate estimates. This topic also shows how the object
oriented model construction procedure simplifies the analysis.
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