Investigations of Human and Organizational Factors in hazardous vapor accidents

► HFACS provides a systematic guideline in accident investigations. The hierarchal structure of HFACS forces investigators to seek out latent HOFs. ► Bayesian Network enhances the ability of the HFACS by allowing experts to quantify the degree of relationships among the HOFs. ► The fuzzy AHP helps to reduce the subjective biases by avoiding the need to give explicit probability values for the variables' states.