Comparison of STPA with Traditional Hazard Analysis Techniques

8 Comparison of STPA with Traditional Hazard Analysis Techniques 

Few formal comparisons have been made yet between STPA and traditional techniques such as fault tree analysis and HAZOP. Theoretically, because STAMP extends the causality model underlying the hazard analysis, non-failures and additional causes should be identifiable, as well as the failure-related causes found by the traditional techniques. The few comparisons that have been made, both informal and formal, have confirmed this hypothesis. 

The effort was bounded and predictable and assisted the engineers in scoping their efforts. Once all the control actions have been examined, the assessment is complete. 

As the control structure is developed and the potential inadequate control actions are identified, they were able to prioritize required changes according to which control actions have the greatest role in keeping the system from transitioning to a hazardous state. 

The STPA safety assessment methodology. .. provided an orderly, organized fashion in 

---