Double spaced, 1″ margins, 12 pitch type in Times New Roman font 4 Pages long The basic equation for risk is defined as R = ƒ(C*V*T) where R is the level of risk, C is the consequences (public health, our economy, government action, public confidence in our institutions) of an attack, V is an assessment of the vulnerability of a potential target (how hard or easy it would be for it to be hit by terrorists) and T is the threat or the likelihood that a specific target will suffer an attack or disaster from a specific weapon.