In general, reliability (systemic def.) is the ability of a person or system to perform and maintain its functions in routine circumstances, as well as hostile or unexpected circumstances. The IEEE defines it as ". . . the ability of a system or component to perform its required functions under stated conditions for a specified period of time." Reliability may refer to: Reliability (statistics), of a set of data and experiments High reliability is informally reported in "nines" Reliabilism in p… (More on Reliability)