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Predictive Human Error Analysis


The Predictive Human Error Analysis technique (PHEA) sometimes referred to as the Human HAZOP is generally carried out prior to a HEART or Hierarchical Task Analysis (HTA).  It is the process of breaking an operational or manufacturing task down into is components parts and analysing it for Performance Influencing Factors (PIFs) and identifying areas for improvement in terms of procedural safeguards.


The PHEA technique is a well-established method for task analysis and is a pre-cursor to human reliability assessment. The first step is to create an overall task diagram that can be developed into sub-tasks, which definitively describes the operational or manufacturing procedure required to complete a safety critical task such as manual venting or draining of the system.  Once identified the task can be analysed for potential human factor failure modes and compared against the PIFs.  Once completed the PHEA outcomes should be improvements to the overall procedure or the requirement for a more quantitative assessment such as HEART.


ProSalus use the PHEA technique as a part of on-site systematic capability assessments where the clients don’t have pre-defined Human Error Probabilities for use in risk analysis for a given task.