HEART Methodology
1. The first stage of the process is to identify the full range of sub-tasks that a system operator would be required to complete within a given task.
2. Once this task description has been constructed a nominal human unreliability score for the particular task is then determined, usually by consulting local experts. Based around this calculated point, a 5th – 95th percentile confidence range is established.
3. The EPCs, which are apparent in the given situation and highly probable to have a negative effect on the outcome, are then considered and the extent to which each EPC applies to the task in question is discussed and agreed, again with local experts. As an EPC should never be considered beneficial to a task, it is calculated using the following formula:
- Calculated Effect = ((Max Effect – 1) × Proportion of Effect) + 1
4. A final estimate of the HEP is then calculated, in determination of which the identified EPC’s play a large part.
Only those EPC’s which show much evidence with regards to their affect in the contextual situation should be used by the assessor.
Read more about this topic: Human Error Assessment And Reduction Technique
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