A barrier-based and holistic approach to manage the risks of blackout
Bow ties are one of many barrier-risk-models available to assist in the identification and management of risk. The figure above shows a simplified bow-tie barrier diagram to present the threats and barriers that contribute to increasing and decreasing the likelihood of blackout and the mitigating barriers for supporting recovery. Barriers in a bow tie contribute to managing risk. Barriers can be characterized as technical or operational barrier elements. Operational barriers can be manifested at an organizational or individual level.
Risk management requires that all factors influencing the human (“H”), organizational (“O”) and technical (“T”) elements are identified, and that the consequences of the interaction between the elements (“HOT”) is understood.