This paper describes a risk-based decision-making framework aimed at helping stakeholders of transport infrastructure to allocate (limited) resources effectively, in order to mitigate the risk of a terrorist attack. The framework is used to model the security system, to consider a multitude of threat scenarios and to assess the decisions taken by the aggressors during the various stages of their attack. One of the key notions presented is the state of partial neutralization, which reveals the losses that incur when the terrorist does not reach the primary target. A rail station of an airport is used as an example to demonstrate this framework.

decision analysis, infrastructure security, probabilistic risk assessment, terrorism