Concepts

Settings

Failure Mode Comparison

The Failure Mode Comparison tool allows you to look at two items side-by-side to see the similarities and differences between them. You can compare two failure modes or two versions of the same failure mode.

The failure modes can originate on different kinds of analyses (MTA2, RCM2, RBI, SIF, or HAZOP), and the analyses can be drawn from the same or different sites. Once you have selected analyses and failure modes to compare, you can change them at any time. This allows you to:

•	Compare a failure mode to two or more other failure modes in succession

•	Compare a template failure mode to any number of failure modes derived from it

•	Follow the evolution of a failure mode from the original version through later versions to the current version or draft

•	Launch the comparison tool from one analysis and compare failure modes on different analyses

The Failure Mode Comparison tool has the following features:

•	Information for the two failure modes is shown side-by-side. Differences are highlighted by icons () displayed on the right side of the window. For example:

•	Lists are shown side-by-side so that you can see the differences. In the case of two versions of a failure mode, the tool also shows lists of items that are exclusive to each version.

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The view bar allows you to navigate to the different sections of the failure mode. Information is limited to what is relevant to both failure modes. For example, if you are comparing two RCM2 failure modes, the RCM2 Evaluation view is available. If you are comparing an MTA2 and an RCM2 failure mode, the RCM2 Evaluation view is disabled. Here is an example of two RBI failure modes:

Note: The following information is not included in comparisons at this time:

•	RCM2 evaluation questionnaires; only the resulting RCM2 evaluations are compared

•	Risk matrices

•	Susceptibility to failure questionnaires

•	Liner confidence evaluations

Starting the Failure Mode Comparison Tool

You can start the comparison tool from a Site, Strategy Development Analysis, or Maintenance Action Plan window.

If you open the tool from an analysis or action plan window (select the “Compare” option in the Tools menu), the source items are shown in the Failure Mode Comparison window. Here is an example of the comparison tool opened from a Maintenance Action Plan window:

When the analysis supports versioning, Two versions of the same failure mode is selected by default. For example:

If you would rather compare failure modes, select Two failure modes.

This rest of this topic explains how to start the tool from the Site window and compare failure modes.

To Compare Failure Modes

1.	On Site window, click the Tools menu, Strategy Development, and then Compare Failure Modes. The Failure Mode Comparison window appears.

2.	The Two failure modes option is selected by default. If you wish to compare versions, select Two versions of the same failure mode.

3.	Select the analyses and failure modes to compare:

•	For two failure modes – Click the browse icons to select the analyses. The Strategy Development Analysis Selector provides several configurations to narrow the search. You can scroll to the right to see the Site column in the table.

Select the failure modes to compare. Each Failure modes list displays only the failure modes on the selected analysis.

•	For two versions – select or browse for the analysis. Then select the two versions.

Tip: Select the more recent version first (in the left-hand list) and then the earlier version. The layout of the screens assumes that the newer version is on the left.

The Failure Mode Comparison window is populated with information.

4.	Select tabs and views to see the juxtaposed information.

5.	When you are finished, click Close.