where do the categories in the hfacs come from
Human Factors Analysis and Classification System HFACS is based in the "Swiss Cheese" model of human error[2] which looks at four levels of active errors and latent failures, including unsafe acts, preconditions for unsafe acts, unsafe supervision, and organizational influences.[1] It is a comprehensive human error framework, that folded Reason's ideas into the applied setting, defining 19 causal categories within four levels of human failure.[3]