Fault tree analysis starts with an undesirable event and works backwards through logical combinations of possible causes. It identifies failure paths and where preventive controls may be required.
How to use this tool
Define the top event
Define the unwanted top event.
Work backwards with logic
Work backwards using AND and OR logic.
Break down to specific causes
Continue until the causes are specific enough to investigate.
Prioritise preventive controls
Validate the causes and prioritise preventive controls.
References & further reading
Vesely, W. E. et al. (1981). Fault Tree Handbook. U.S. Nuclear Regulatory Commission, NUREG-0492.