At its core, the process entails describing a system object (such as a person or machine) that intends to conduct some activity.
During the performance of that activity, an adverse event (referred to as a “factor”) may be encountered that could cause or contribute to an occurrence (mishap, incident, accident).
For instance, the probability of encountering an icy bridge may be reduced by adding salt such that the ice will melt.
The severity of consequence identified by the hazard analysis establishes the criticality level of the software.
[citation needed] In 2009[1] a leading edge commercial standard was promulgated based on decades of proven system safety processes in DoD and NASA.
When used as part of an aviation hazard analysis, "Severity" describes the outcome (the degree of loss or harm) that results from an occurrence (an aircraft accident or incident).
(medical devices) When used as part of an aviation hazard analysis, a "Likelihood" is a specific probability.