The relationship between criticality and accessibility has been studied habitually by military, law enforcement and security personnel since the Vietnam war. Criticality and accessibility are only two of the six factors measured using the CARVER model, which has been an accepted methodology in the security industry since its inception. CARVER is an acronym used by industry professionals to assess overall client risk and is comprised of the following elements: Criticality, Accessibility, Recuperability, Vulnerability, Effects and Recognizability.
