Ease of activation could be measured as the inverse of the effectiveness of the controls on the hazard. For instance, a pathogen that is sealed inside a container, which is placed within a vault,...

Ease of activation could be measured as the inverse of the effectiveness of the controls on the hazard. For instance, a pathogen that is sealed inside a container, which is placed within a vault, within a locked building, within a guarded perimeter, becomes less likely to be activated as we put more containers around it.