NASA Procedures and Guidelines

This Document is Obsolete and Is No Longer Used.
Check the NODIS Library to access the current version:
http://nodis3.gsfc.nasa.gov

NPR 8621.1

Eff. Date: June 02, 2000

Cancellation Date: February 11, 2004

NASA Procedures and Guidelines for Mishap Reporting, Investigating, and Recordkeeping

Appendix I-3.2. Management Oversight and Risk Tree (MORT)
Use of the MORT technique helps the investigator to systematically and logically analyze a system or mishap in order to examine and determine detailed information about the process inner-workings to include identification of hazards and mishap causes.

1.1 Method

The method applies a predesigned, systematized logic tree to the identification of total system risks; both those inherent in physical equipment and processes and those which arise from operational management inadequacies. The pretree, intended as a comparison tool, generally describes all phases of a safety program applicable to systems and processes of all kinds. The technique is of particular value in mishap/incident investigation as a means of discovering system or program weaknesses or errors which provide an environment conducive to mishaps.

1.2 Thoroughness

Design of the "model" tree, against which comparison judgments are made, is exhaustively complete. As a result, thoroughness is limited only by the degree to which the analysis explores the existing or contemplated system, in mirroring it against the model tree. The technique is not difficult to apply once mastery is achieved. Graphic aids and explanatory texts are available.

1.3 General Comments

Popularity of the technique in mishap/incident investigation is increasing. The MORT chart and manual are available through the System Safety Development Center, EG&G Idaho, Idaho Falls, ID, 83415, and through the National Safety Council.

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NASA Procedures and Guidelines

This Document is Obsolete and Is No Longer Used. Check the NODIS Library to access the current version: http://nodis3.gsfc.nasa.gov

NASA Procedures and Guidelines for Mishap Reporting, Investigating, and Recordkeeping

DISTRIBUTION: NODIS

This Document is Obsolete and Is No Longer Used. Check the NODIS Library to access the current version: http://nodis3.gsfc.nasa.gov

This Document is Obsolete and Is No Longer Used.
Check the NODIS Library to access the current version:
http://nodis3.gsfc.nasa.gov

DISTRIBUTION:
NODIS

This Document is Obsolete and Is No Longer Used.
Check the NODIS Library to access the current version:
http://nodis3.gsfc.nasa.gov