ability to perform as and when required
Note 1 to entry: Dependability is mainly business oriented.
Note 2 to entry: IEC/TC 56 which is the international “dependability” technical committee deals with reliability,
availability, maintainability and maintenance support. More than 80 dependability standards have been published
by the IEC/TC56. In particular, it is in charge of the international vocabulary related to those topics (IEV 191)
and also of the methods used in the reliability field (e.g. FMEA, HAZOP, reliability block diagrams, fault trees,
Markovian approach, event tree, Petri nets).
Note 3 to entry: The production availability is an extension, for production systems, of the classical dependability
measures. This term is defined in the ISO 20815 standard which deals with production assurance and relates
to systems and operations associated with drilling, processing and transport of petroleum, petrochemical and
natural gas. The relationship between production-assurance terms can be found in Figure G.1 of ISO 20815.
[SOURCE: IEC 60050 −191].
Source: ISO/TR 12489:2013(E), Global Standards