Henri Heinrichs Five-Factor Accident Sequence

Henri Heinrich s Five-Factor Accident Sequence 

Heinrich s research in the area of accident causation concluded that 88% of investigated accidents resulted from unsafe acts. Heinrich attributed 10% to unsafe conditions, and he classified 2% as unpre-ventable. Heinrich suggested that an individual s life experiences and background could predispose  

System safety methods assume that accidents and mishaps result from multiple causal factors. System thinking views hazards and causal factors as moving in logical sequences to produce accident events. Refer to Chapter 4 for additional information on system safety methods. 

Traditional approaches to accident prevention simply classify causal factors as unsafe acts and unsafe conditions. Hazard control personnel should use root-cause processes to discover, document, and analyze acddent causal factors. Acddent investigations and root-cause analyses (RCA) should focus on discovering information about system operation, deterioration, and original design errors. System-related hazard control efforts focus on unsafe system conditions and the interaction 

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