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Fortsetzung ...

F. Definitionen gemäß IEV /IEV2001/ 

191-02-03 Zuverlässigkeit

zusammenfassender Ausdruck zur Beschreibung der Verfügbarkeit und ihrer Einflussfaktoren Funktionsfähigkeit, Instandhaltbarkeit und Instandhaltungsbereitschaft

ANMERKUNG: Zuverlässigkeit wird nur für allgemeine Beschreibungen in nichtquantitativem Sinne benutzt.


the collective term used to describe the availability performance and its influencing factors: reliability performance, maintainability performance and maintenance support performance

NOTE: Dependability is used only for general descriptions in non-quantitative terms.

191-05-25 menschliches Versagen (menschliches) Fehlverhalten

Handlung eines Menschen, die zu einem unerwünschten Ergebnis führt

 mistake human error

a human action that produces an unintended result

G. Definitionen gemäß IEV /IEV2005/ 

191-42-03 dependability (of an item)

ability to meet success criteria, under given conditions of use and maintenance

NOTE 1 The success criteria may be attributes or variables, expressed or implied, and may include, availability of the required service, safety, integrity, security, etc.

NOTE 2 An example of an implied success criterion is, that the item shall be safe for the user, other interested parties, property and the environment.

NOTE 3 Dependability is achieved by due attention to failure prediction, prevention and mitigation.

191-44-01 failure (of an item)

termination of the ability to perform a required function

NOTE 1 “Failure" is an event, as distinct from "fault", which is a state.

NOTE 2 A failure usually results in a fault state (191-45-01) but in some circumstances, a failure may result from a pre-existing fault state (see 191-45-20 latent fault).

191-44-02 critical failure

failure that can cause injury to persons, significant material damage or other unacceptable consequences

NOTE “Critical” refers to the level of severity of the failure, according to the assessed likely outcome.

191-45-01 fault (of an item)

state causing inability to perform a required function

NOTE 1 Inability during preventive maintenance or other planned actions, or due to lack of external resources does not constitute a fault state.

NOTE 2 A fault is often the result of a failure of the item itself, but may exist without prior failure.

NOTE 3 In English, the term fault is also used in the field of electric power systems with the meaning given in 604-02-01; then, the corresponding term in French is "défaut".

NOTE 4 The nature of the failure determines the type of a fault, e.g., a critical failure results in a critical fault.

191-45-02 critical fault

condition assessed as likely to result in injury to persons, significant material damage, or other unacceptable consequences

191-45-24 error

discrepancy between a computed, observed or measured value or condition and the true, specified or theoretically correct value or condition

NOTE 1 An error can be caused by a faulty item, e.g. a computing error made by faulty computer equipment.

NOTE 2 The French term "erreur" may also designate a mistake (see 191-45-25).

191-45-25 human error


discrepancy between the human action taken and the specified or theoretically correct action

Udo Voges
Forschungszentrum Karlsruhe
Institut für Angewandte Informatik



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