Formative vs. Summative Dependence in Human Reliability Analysis

Solutions for Enhanced Legacy Probabilistic Risk Assessment Tools and Methodologies: Improving Efficiency of Model Development and Processing via Innovative Human Reliability Dependency Analysis

“…Within traditional HRA, the dependency calculation is the last step for HEP quantification, and dependence can essentially override previously estimated HEPs to the extent where Boring, Park, and Mortenson (2021) suggest conducting a dependency screening to examine whether non-dependency factors (nominal HEP and basic HEP) even need to be considered. In the HRA domain, the contention is that discarding dependency could lead to a critical underestimation of human error probabilities.…”

Flppr: Cognitive Loading Task for Error Dependency Research

“…With traditional HRA dependency calculation is the last step for HEP quantification and dependence can essentially override previously estimated HEPs to the extent where Boring, Park, and Mortenson (2023) suggest conducting a dependency screening to examine whether non-dependency factors (nominal HEP and basic HEP) even need to be considered.…”

“…We are now 40 years past Swain and Guttman's first description of error dependence. Despite the multi-decade period we still do not have a concrete understanding of error dependence to support human reliability analysis (Mortenson and Boring, 2023). Notably, task batteries treat tasks as independent and do not account for task dependency.…”