Risk Assessment > Management Oversight Risk Tree (MORT)

De Vinci Man image Management Oversight Risk Tree (MORT)
Description : MORT was developed by William Johnson under the auspices of the U.S. Atomic Energy Commission. MORT is a comprehensive, analytical, disciplined method for determining the causes and contributing factors of major incidents. The MORT chart is the key diagram for the whole MORT system safety program. This chart sets down, in an orderly way, all the potential causal factors for accidents. Analysis is carried out by means of a fault tree.
Advantages : 1) Highly detailed. A full MORT diagram or tree contains more than 10,000 blocks. 2) Very effective in identifying underlying management root causes of hazards. 3) Can also be used to predict the adequacy of control elements already in place to prevent accidents. 4) Provides a systematic method of evaluating the specific control and management factors that caused or contributed to the accident.
Disadvantages : 1) Time-consuming and costly. Should be used for only the most difficult or high profile events. 2) MORT not only looks at what happened during an incident, but traces causal factors back to management systems to identify why events happened, thereby departing from strict FTA logic. 3) MORT is not a technique that would be used in the field. The analysis would therefore start with an accident report and possibly a sequence diagram 4) MORT therefore uses similar symbols and logic to that used in FTA
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Tool Type : Software
References : 1) Whitaker-Sheppard, D. & Wendel, T. Analysis of the Causes of Chemical Spills from Marine Transportation or Related Facilities. U. S. Coast Guard Research and Development Center, Report No. CG-D-08-96 (1996). 2) FAA System Safety Handbook, Appendix F, (December 30, 2000)
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