Risk Analysis Methodology



          After applying the various analysis techniques to identify risks, there are additional tasks involving: Risk assessment, hazard control analysis, requirements cross-check analysis, and hazard tracking and risk resolution. 
                Risk Assessment 
Risk assessment is the classification of relative risk associated with identified hazards. Risk has two elements, which are severity and likelihood. Severity is the degree of harm that would occur if an accident happens. Likelihood is a qualitative expression of the probability that the specific accident will occur. 
             Criteria for severity and likelihood should be defined. When risk assessment is to be conducted, the risks should be prioritized to enable resources to be allocated consistently to the highest risks. 

               Matrix indicates the related hazard code, hazard or scenario description, and scenario code. Both initial risk and final risk associated with the specific scenario is also indicated. There is also a section for supportive comments. 

                                        Hazard Control Analysis 
To compare the generic hazards with those of a specific system, the maintenance procedures published for the system are formatted into a matrix. The matrix should list the detailed maintenance procedures and could serve as a method for correlating the hazards and controls with the discrete tasks to be performed on the system. Hazards specific to the system that have not included in the maintenance procedures are also to be identified during this step of the evaluation and integration. 

 A matrix will be used to document and assess the following: 

 • Changes needed to eliminate or control the hazard or reduce the associated risk 
• Requirements for design enhancements, safety devices, and equipment, including 
personnel safety 
• Warnings, cautions, and special emergency procedures (e.g., egress, escape, render 
safe, or back-out procedures), including those necessitated by failure of a computer 
software-controlled operation to produce the expected and required safe result or 
indication 
• Requirements for packaging, handling, storage, transportation, maintenance, and 
disposal of hazardous materials 
• Requirements for safety training. 
• Potentially hazardous system states 
• Federal laws regarding the storage and handling of hazardous materials. 
Requirements Cross-Check Analysis 

 A requirements cross-check analysis should be performed. 
Any appropriate requirements that are applicable to specific hazard controls are to be provided as a technical reference. 
Any hazard control that is formally implemented becomes a specific requirement. 
Requirements cross-check analysis is a common technique in the system safety engineering discipline. 
A hazard control is considered verified when it is accepted as a formal program requirement through a process known as hazard tracking and risk resolution. 

 The requirement cross check analysis is a technique that relates the hazard description or risk to specific controls and related requirements.  It is comprised of the following elements: hazard description code, hazard description, or accident scenario, the hazard rationale, associated with a specific exposure or piece of equipment. The matrix also displays a control code, hazard controls, and it also provides reference columns for appropriate requirement cross check. For this example, OSHA requirements, FAA requirements and National Fire Protection 
Association requirements are referenced. 
SAFETY FIRST ALWAYS

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