Risk Reduction Distributions Relating to the Benefits of Safety Efforts

摘要

The benefit of including safety in new efforts has historically been described qualitatively. The objective of this paper is to update our recently defined equations showing value added from a safety activity and establish a method for the future quantification of a safety benefit. This paper approximates the distributions of mishap risk and compares the likely differences of mishap risk distributions before and after a safety effort. The result is a measure of safety improvement to a given effort. With this new approach, we show that, in many cases, the distribution can be approximated as lognormal with a small offset term.