How to Create a Fault Tree Analysis Diagram (FTD)

The failure of an item in a system is often caused by the failure of other items. Fault Tree Analysis, or FTA, provides a method of breaking down such chains of failures, with a key addition for identifying combinations of faults that cause other faults. Fault Tree Analysis Diagrams (or negative analytic trees) are logic block diagrams that display the state of a system (top event) in terms of the states of its components (basic events). ConceptDraw DIAGRAM allows you to create professional FTA Diagrams using the Fault Tree Analysis Diagrams solution.

Open a ConceptDraw DIAGRAM new document and select the Fault Tree Analysis Diagrams library.
Add the proper FTD elements to the diagram by dragging them from the library to the document page.
The Fault Tree diagram should be started with the Event symbol for top-level failure event.
Use the OR gate symbol to the output event occurs if at least one of the input events occurs.
The Basic event symbol is used for event that does not have any contributory events.
An AND gate symbol means the output event occurs if all input events occur.
Use the Exclusive OR gate symbol to the output event occurs if exactly one input event occurs.
Next, you need to connect the objects. To do this, select the neighbor objects and click the Chain Connection button.

Change objects' appiarence using the Format panel options.

To add text to an object, select it, and then start typing. When you are finished, click outside the object.
To distribute objects at regular intervals, select the objects, and then, on the Arrange&Size panel, pick a needed option from the Align and Distribute section.

To align objects horizontally or vertically, select the objects you want to align, then, on the Arrange&Size panel, select the proper option from the drop-down menu.