Human Reliability Analysis stages

As mentioned by Swain and Guttmann (1983), human reliability is the probability of the successful conclusion of a procedure or task by the operator or team in any stage of the system operation, considering the minimal necessary time (when the time dimension is relevant). Human reliability analysis (HRA) evaluates human actions in a system, considering the factors which contribute to his performance, and it commonly shows incompatibilities among human limitations and the conditions imposed by work. Some of these factors are related to time restrictions, excessive workloads, inadequate training of operators, inadequate procedures, task complexity, and so on. 

Stages Safety Review Checklist Relative Ranking Preliminary Hazard Analysis What-if Checklist HAZOP FMEA Cause- Consequence Analysis Human Reliability Analysis Fault Tree Event Tree... 

A Human Reliability Analysis (HRA) usually consists of the following stages ... 

When performing human reliability assessment in CPQRA, a qualitative analysis to specify the various ways in which human error can occur in the situation of interest is necessary as the first stage of the procedure. A comprehensive and systematic method is essential for this. If, for example, an error with critical consequences for the system is not identified, then the analysis may produce a spurious impression that the level of risk is acceptably low. Errors with less serious consequences, but with greater likelihood of occurrence, may also not be considered if the modeling approach is inadequate. In the usual approach to human reliability assessment, there is little assistance for the analyst with regard to searching for potential errors. Often, only omissions of actions in proceduralized task steps are considered. 

Techniques for the identification and evaluation of human error are typically labeled Human Reliability Assessments (HRA). A complete HRA starts with a definition of the problem and development of a task analysis to support the HRA (Kirwan, 2005). The core of HRA is the Human Error Identification (HEI) and Human Error Quantification (HEQ) stages, and several methods have been developed to specifically focus on these two areas. From these, control measures can be identified to reduce the overall system risk. 

---