scope:

This part of IEC 60050 gives the general terminology used in the field of dependability. The terms are generic and are applicable to all fields of dependability methodology, including electrotechnical applications. The document is not an exhaustive vocabulary for all IEC standards in the dependability field: definitions for some specialist terms may only be found in the relevant standards. This document is based on IEC 60050-191:1990 Edition 1, which has been subjected to a systematic, in-depth review and revision, in order to: reflect current usage in the dependability field; introduce new terms from new or revised standards, and other informed sources; and provide a grammatical form of definition to comply with the IEC directives. In producing this document, several sections of edition 1 (formerly Chapter 191) concerning quality of service, have been omitted: sections 19 and 20: Quality of service in telecommunications, has been adopted and developed by the International Telecommunication Union, as publication ITU-T E.800, Definitions of terms related to quality of service, and sections 21 to 30, inclusive: Quality of service in electric power systems, has been developed as IEC 60050-692, Part 692, Electric power systems: Dependability and quality of service. This terminology is consistent with the terminology developed in the other specialized parts of IEC 60050.