Computing an Assessment

You can create an assessment that refers to the opened fault tree. The purpose of an assessment is to evaluate and store the computation results.

An assessment refers to a fault tree on which computation has to be performed and computation results, including gates probability and a limited amount of cutsets.

More precisely, an assessment refers to target requirements, analysis, results requirements, reliability source and operational conditions. It also contains more detailed analysis results.

Before you begin:
Important: To enable the computation commands:
  1. Hypervisor must be installed on an accessible server.

    For more information, see the Fault Tree Analysis Installation Guide.

  2. The URL of the server must be defined in the widget preferences.

    For more information, see Customizing Preferences.

To successfully compute a model:

  1. Create a fault tree.
  2. Optionally, assign reliability formulas to the basic events.
    Note: You can compute a fault tree:
    • Without reliability formula: for a qualitative evaluation (cutsets analysis)
    • With reliability formulas: for a qualitative and quantitative evaluation (probability metrics)
  3. Create an assessment to store the computation result.

  1. From the Analyze section of the action bar, click Compute Current Assessment .
    The results of the computation appear under the Results section. The numerical results also appear on each gate of the tree to analyze precisely the fault tree design.
    Note: After you use the compute command, the status changes to up to date.
  2. To go deeper in the results analysis, use cutsets. For more information, see Managing Cutsets.