This is intended to be a high-level explanation of an assessment of the human contribution to risk, commonly known as the Human Reliability Assessment (HRA).
There are two distinct types of HRA:
- qualitative assessments that aim to identify potential human failures and optimize the factors that may influence human performance, and
- quantitative assessments, which, in addition, aim to estimate the likelihood of such failures occurring.
The results of quantitative HRAs can feed into traditional engineering risk assessment tools and methodologies, such as event and fault tree analysis or Human Error HAZOP.