Fault tree analysis is a graphical representation of the major faults or critical failures associated with a product, the causes for the faults, and potential countermeasures. The tool helps identify areas of concern for new product design or for improvement of existing products. It also helps identify corrective actions to correct or mitigate problems.

Fault Tree Diagram Software

Edraw Max is a vector-based diagramming software with rich examples and templates. Easy to create fault tree diagrams to document business processes. Create diagrams that document events that might lead to failure so that failures can be prevented.

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Build-in Shapes for the Fault Tree Diagram

Create Fault Tree diagrams to document business processes. Document 6 Sigma and ISO 9000 processes.

Fault Tree Diagram Examples

Suppose we visit the courthouse in a certain town, and we observe people who stop at the office of the local justice of the peace to register their marriages. Let A be the independent probability of finding in the office an adult woman who is going to get married (i.e., female spouse), while B is the probability of finding a marrying adult man (i.e., male spouse). We disregard any liaison between staff members who are employed in that office in order to be free of bias in our experiment.

Fault Tree Template

The follow fault tree diagram was created and included in the edraw example gallery.

How to use Fault Tree Diagram

Create professional looking Fault Tree diagram from examples and templates with Edraw. Click here to download Fault Tree Analysis Software. Then you can use the build-in Fault Tree template to create and present your business process in minutes.

• Select a component for analysis. Draw a box at the top of the diagram and list the component inside.
• Identify critical failures or "faults" related to the component. Using Failure Mode and Effect Analysis is a good way to identify faults during quality planning. For quality improvement, faults may be identified through Brainstorming or as the output of Cause and Effect Diagram.
• Identify causes for each fault. List all applicable causes for faults in ovals below the fault. Connect the ovals to the appropriate fault box.
• Work toward a root cause. Continue identifying causes for each fault until you reach a root or controllable cause.
• Identify countermeasures for each root cause. Use Brainstorming or a modified version of Force Field Analysis to develop actions to counteract the root cause of each critical failure. Create boxes for each countermeasure, draw the boxes below the appropriate root cause, and link the countermeasure and cause.

When to use Tree Analysis

Fault tree analysis is useful both in designing new products/services or in dealing with identified problems in existing products/services. In the quality planning process, the analysis can be used to optimize process features and goals and to design for critical factors and human error. As part of process improvement, it can be used to help identify root causes of trouble and to design remedies and countermeasures.

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