Abstract: A computer-implemented system determines, by logical progression through multiple analysis levels, a human factor that represents a root cause of a particular incident. The system begins at a broad analysis level and progresses through more narrow analysis levels to a root cause level. Each analysis level includes multiple causal factor categories, with each causal factor category branching into causal factor subcategories that reside on a more narrow analysis level. The system includes an information input device for inputting incident information relating to the particular incident. The system also includes a memory device for storing a causal information database that provides a relationship between the multiple analysis levels and causal factor categories and between causal factor categories and root causes. The causal information database also relates root causes to corrective actions that may be implemented to prevent future occurrences of the incidents.