SIST EN IEC 60300-3-4:2022
(Main)Dependability management - Part 3-4: Application guide - Specification of dependability requirements (IEC 60300-3-4:2022)
Dependability management - Part 3-4: Application guide - Specification of dependability requirements (IEC 60300-3-4:2022)
This part of IEC 60300 gives guidance on specifying dependability requirements and collating
these requirements in a specification, together with a list of the means of assuring the
achievement of the dependability requirements.
The guidance provided includes:
• specifying quantitative and qualitative reliability, maintainability, supportability and
availability requirements;
• advising acquirers on how to ensure that the requirements can be fulfilled by suppliers;
• advising suppliers to help them meet the acquirer's requirements.
Other obligations, such as legislation and governmental regulations, can also place
requirements on items, in addition to any requirements derived in accordance with this
document.
Whilst mainly addressing system and equipment level dependability, many of the techniques
described in the various dependability related IEC standards can also be applied to products or
at the component level. The term "item" is used throughout this document.
This guidance is given in a basic project context where an acquirer obtains an item from a
supplier. It can be modified and adapted to other situations as needed.
NOTE 1 This document does not directly consider safety and environment specifications although much of the
guidance in this document could also be applied to them.
NOTE 2 This document does not cover items with special multi-stakeholder long-term arrangements (e.g. services
provided through Public-Private Partnership procurements) and how dependability is specified in such arrangements.
NOTE 3 The guidance in this document can be applied to some aspects of the specification of requirements relating
to software but specific guidance can be found in IEC 62628 [5] and the different parts of the IEC 61508 series [6].
Zuverlässigkeitsmanagement - Teil 3-4: Anwendungsleitfaden - Anleitung zum Festlegen von Zuverlässigkeitsforderungen (IEC 60300-3-4:2022)
Gestion de la sûreté de fonctionnement - Partie 3-4: Guide d'application - Spécification d'exigences de sûreté de fonctionnement (IEC 60300-3-4:2022)
L'IEC 60300-3-4:2022 fournit des recommandations relatives à la spécification des exigences de sûreté de fonctionnement et au rassemblement de ces exigences dans une spécification, ainsi qu'une liste des moyens permettant d’assurer la réalisation des exigences de sûreté de fonctionnement.
Les recommandations fournies comprennent:
• la spécification d’exigences quantitatives et qualitatives de fiabilité, de maintenabilité, de supportabilité et de disponibilité;
• des conseils aux acquéreurs portant sur la façon d’assurer que les exigences peuvent être satisfaites par les fournisseurs;
• des conseils aux fournisseurs afin de les aider à satisfaire aux exigences des acquéreurs.
D’autres obligations telles que des règlements législatifs et gouvernementaux peuvent aussi imposer des exigences relatives aux entités, en plus de toutes les exigences déduites conformément au présent document.
Upravljanje zagotovljivosti - 3-4. del: Navodilo za uporabo - Specifikacija zahtev za zagotovljivost (IEC 60300-3-4:2022)
Ta del standarda IEC 60300 podaja smernice za določanje zahtev glede zagotovljivosti in združevanje teh zahtev v specifikacijo, skupaj s seznamom sredstev za izpolnjevanje zahtev glede zagotovljivosti.
Smernice vključujejo:
• določanje kvantitativnih in kvalitativnih zahtev glede zanesljivosti, vzdržljivosti, podpore in razpoložljivosti;
• svetovanje prevzemnikom, kako lahko zagotovijo, da dobavitelji izpolnijo zahteve;
• svetovanje dobaviteljem, kako najlažje izpolniti zahteve prevzemnika.
Poleg vseh zahtev, izpeljanih v skladu s tem dokumentom, morajo elementi izpolnjevati morda tudi druge zahteve, ki jim jih nalagajo zakonodaja in vladni predpisi.
Številne tehnike, opisane v različnih standardih IEC v zvezi z zagotovljivostjo, se v glavnem navezujejo na zanesljivost na ravni sistema in opreme, vendar jih je mogoče uporabiti tudi za izdelke ali na ravni komponent. Izraz »element« se uporablja v celotnem dokumentu.
Te smernice so podane v okviru osnovnega projekta, kjer prevzemnik pridobi element od dobavitelja. Po potrebi jih je mogoče spremeniti in prilagoditi drugim situacijam.
OPOMBA 1: Ta dokument ne obravnava neposredno varnostnih in okoljskih specifikacij, čeprav bi se večina smernic v tem dokumentu lahko uporabila tudi zanje.
OPOMBA 2: Ta dokument ne zajema elementov s posebnimi dolgoročnimi dogovori z več zainteresiranimi stranmi (npr. storitve, opravljene prek javnih naročil v okviru javno-zasebnega partnerstva) in tega, kako je v takih dogovorih določena zagotovljivost.
OPOMBA 3: Smernice v tem dokumentu je mogoče uporabiti za nekatere vidike specifikacije zahtev v zvezi s programsko opremo, vendar je mogoče specifične smernice najti v standardu IEC 62628 [5] in različnih delih skupine standardov IEC 61508 [6].
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 60300-3-4:2022
01-junij-2022
Nadomešča:
SIST EN 60300-3-4:2008
Upravljanje zagotovljivosti - 3-4. del: Navodilo za uporabo - Specifikacija zahtev za
zagotovljivost (IEC 60300-3-4:2022)
Dependability management - Part 3-4: Application guide - Specification of dependability
requirements (IEC 60300-3-4:2022)
Zuverlässigkeitsmanagement - Teil 3-4: Anwendungsleitfaden - Anleitung zum Festlegen
von Zuverlässigkeitsforderungen (IEC 60300-3-4:2022)
Gestion de la sûreté de fonctionnement - Partie 3-4: Guide d'application - Spécification
d'exigences de sûreté de fonctionnement (IEC 60300-3-4:2022)
Ta slovenski standard je istoveten z: EN IEC 60300-3-4:2022
ICS:
03.120.01 Kakovost na splošno Quality in general
21.020 Značilnosti in načrtovanje Characteristics and design of
strojev, aparatov, opreme machines, apparatus,
equipment
SIST EN IEC 60300-3-4:2022 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 60300-3-4:2022
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SIST EN IEC 60300-3-4:2022
EUROPEAN STANDARD EN IEC 60300-3-4
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2022
ICS 03.100.40; 03.120.01 Supersedes EN 60300-3-4:2008
English Version
Dependability management - Part 3-4: Application guide -
Specification of dependability requirements
(IEC 60300-3-4:2022)
Gestion de la sûreté de fonctionnement - Partie 3-4: Guide Zuverlässigkeitsmanagement - Teil 3-4:
d'application - Spécification d'exigences de sûreté de Anwendungsleitfaden - Anleitung zum Festlegen von
fonctionnement Zuverlässigkeitsforderungen
(IEC 60300-3-4:2022) (IEC 60300-3-4:2022)
This European Standard was approved by CENELEC on 2022-04-15. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60300-3-4:2022 E
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SIST EN IEC 60300-3-4:2022
EN IEC 60300-3-4:2022 (E)
European foreword
The text of document 56/1932/FDIS, future edition 3 of IEC 60300-3-4, prepared by IEC/TC 56
"Dependability" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60300-3-4:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-01-15
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-04-15
document have to be withdrawn
This document supersedes EN 60300-3-4:2008 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60300-3-4:2022 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
1 2
IEC 60300-1:— NOTE Harmonized as EN 60300-1:— (not modified)
IEC 60300-3-1 NOTE Harmonized as EN 60300-3-1
3
IEC 60300-3-10 NOTE Harmonized as EN IEC 60300-3-10
IEC 60300-3-14 NOTE Harmonized as EN 60300-3-14
IEC 62628 NOTE Harmonized as EN 62628
IEC 61508 (series) NOTE Harmonized as EN 61508 (series)
IEC 62960 NOTE Harmonized as EN IEC 62960
IEC 60706-3 NOTE Harmonized as EN 60706-3
IEC 62308 NOTE Harmonized as EN 62308
IEC 62741 NOTE Harmonized as EN 62741
IEC 60300-3-3 NOTE Harmonized as EN 60300-3-3
1
Fourth edition under preparation. Stage at the time of publication: IEC PCC 60300-1:2022.
2
Under preparation. Stage at the time of publication: prEN 60300-1.
3
Under preparation. Stage at the time of publication: prEN IEC 60300-3-10.
2
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SIST EN IEC 60300-3-4:2022
EN IEC 60300-3-4:2022 (E)
ISO 9000 NOTE Harmonized as EN ISO 9000
IEC 60706-5 NOTE Harmonized as EN 60706-5
IEC 62506 NOTE Harmonized as EN 62506
IEC 61025 NOTE Harmonized as EN 61025
IEC 61078 NOTE Harmonized as EN 61078
IEC 61703 NOTE Harmonized as EN 61703
IEC 61649 NOTE Harmonized as EN 61649
IEC 61710 NOTE Harmonized as EN 61710
IEC 62402 NOTE Harmonized as EN IEC 62402
IEC 61709 NOTE Harmonized as EN 61709
ISO 9001 NOTE Harmonized as EN ISO 9001
IEC 62429 NOTE Harmonized as EN 62429
3
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SIST EN IEC 60300-3-4:2022
EN IEC 60300-3-4:2022 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-192 - International electrotechnical vocabulary - - -
Part 192: Dependability
4
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SIST EN IEC 60300-3-4:2022
IEC 60300-3-4
®
Edition 3.0 2022-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Dependability management –
Part 3-4: Application guide – Specification of dependability requirements
Gestion de la sûreté de fonctionnement –
Partie 3-4: Guide d'application – Spécification d'exigences de sûreté de
fonctionnement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 03.100.40; 03.120.01 ISBN 978-2-8322-1059-0
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 60300-3-4:2022
– 2 – IEC 60300-3-4:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Specifying dependability . 10
4.1 Description of dependability specification . 10
4.2 Principles . 13
4.3 Benefits . 15
5 Derivation of dependability requirements . 15
5.1 General . 15
5.2 Define stakeholder needs and expectations . 17
5.3 Develop supporting documentation . 18
5.4 Derive dependability requirements . 19
5.5 Justify the measures used for the dependability requirements . 33
5.6 Complete dependability specification . 34
5.7 Review dependability specification . 34
Annex A (informative) Discussion on useful life . 35
A.1 General . 35
A.2 Factors that determine useful life . 35
A.3 Specification of useful life of non-repairable items (components) . 36
Annex B (informative) Process for prioritizing dependability attributes . 38
Annex C (informative) Development of a dependability specification for a home
security system . 40
C.1 Define stakeholder needs and expectations . 40
C.2 Develop supporting documentation . 40
C.3 Derive the dependability requirements . 45
C.4 Complete dependability specification . 46
Annex D (informative) Influencing factors for dependability specification . 48
D.1 Examples of constraints on system dependability . 48
D.2 Type of system operation . 48
D.3 Criticality of operation . 49
D.4 Determining relevant influencing factors for the evaluation of system
functions . 52
Bibliography . 54
Figure 1 – High level process for derivation of dependability requirements in the
specification. 16
Figure 2 – What are we trying to achieve? . 18
Figure 3 – What do we need to manage? . 22
Figure 4 – What constraints are there? . 22
Figure 5 – Assurance considerations . 23
Figure 6 – Reliability requirements . 27
Figure 7 – Maintainability requirements . 28
Figure 8 – Supportability requirements . 31
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Figure 9 – Availability requirements . 33
Figure B.1 – Process for prioritizing attributes . 39
Figure C.1 – System configuration for normal mode of operation . 44
Figure C.2 – System configuration for panic mode of operation . 44
Figure C.3 – System configuration for security service mode of operation . 45
Table B.1 – Questions for prioritizing dependability attributes . 38
Table D.1 – Examples of influencing factors under each influencing condition . 52
Table D.2 – Relationship of system properties with influencing conditions . 53
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DEPENDABILITY MANAGEMENT –
Part 3-4: Application guide –
Specification of dependability requirements
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60300-3-4 has been prepared by IEC technical committee 56: Dependability. It is an
International Standard.
This third edition cancels and replaces the second edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) consistency with the other of the six core IEC dependability standards;
b) a process for defining requirements has been included;
c) the definitions and language used have been made consistent with other system related
standards.
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IEC 60300-3-4:2022 © IEC 2022 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
56/1932/FDIS 56/1939/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 60300 series, published under the general title Dependability
management, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
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INTRODUCTION
Dependability is the ability to perform as and when required. A dependable item is one where
there is justified confidence that it operates as desired and satisfies agreed stakeholder
expectations.
Dependability has many attributes, but is usually characterized in terms of reliability,
maintainability, and supportability, and the derived characteristic of availability. Dependability
also includes the performance characteristics such as durability, testability and restorability as
well as security and integrity, particularly in relation to software-based systems.
Dependability is an important attribute that affects the value items generate. Consequently,
relevant dependability attributes should be defined and specified in addition to functional
performance requirements and physical attributes. Whilst mainly addressing system and
equipment level dependability, many of the techniques described in the various dependability
related IEC standards may also be applied to products or at the component level. The term
"item" is used throughout this document to mean an individual part, component, device,
functional unit, off-the-shelf (OTS) equipment, subsystem, or system. The item may consist of
hardware, software, people or any combination thereof (see IEC 60050-192). In order to refer
to a specific kind of "item", terms like component, OTS, product or large open system are used.
Dependability attributes may be specified for an individual system or product (for example, a
vehicle) and/or a group of similar systems or products (for example, a fleet of similar vehicles).
Dependability attributes may be specified using either quantitative and/or qualitative measures.
In order to assess the values of some of the dependability attributes achieved, statistical
methods may be necessary.
The levels of reliability, maintainability, supportability and availability achieved by an item
depend on the conditions under which it is realized, utilized, maintained and supported and also
on the life profile of the system. The requirements in the dependability specification, should
also define the following:
• conditions under which the item is stored, transported, realized and utilized;
• life profile and expected useful life;
• maintenance policies;
• available support.
Dependability attributes may be specified, along with other performance characteristics, in
various ways depending on the situation. In a basic project context where an acquirer obtains
an item from a supplier, three main types are:
1) specifications written by the supplier;
2) specifications written by the acquirer;
3) specifications mutually agreed or written by the supplier and the acquirer.
The guidance in this document is applicable to all three types of specifications and may be
adapted to other situations as needed.
This document provides guidance for writing dependability requirements in specifications,
together with a means of assuring the achievement of those requirements.
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IEC 60300-3-4:2022 © IEC 2022 – 7 –
This document is one of the six "top level" interrelated dependability standards that provide
managers and technical personnel with guidance on how to effectively plan and implement
dependability activities. As such, this document should be used in conjunction with:
1
• IEC 60300-1 [1] , which highlights the importance and benefits of managing dependability.
It gives guidance on dependability activities and how to integrate them into an existing
management system and life cycle processes;
• IEC 60300-3-1 [2], IEC 60300-3-10 [3], IEC 60300-3-14 [4] which provide guidance on how
to identify and apply appropriate analysis and assurance techniques for reliability,
maintainability (and maintenance) and supportability (and support) respectively. A standard
to cover availability is planned.
____________
1
Numbers in square brackets refer to the Bibliography.
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DEPENDABILITY MANAGEMENT –
Part 3-4: Application guide –
Specification of dependability requirements
1 Scope
This part of IEC 60300 gives guidance on specifying dependability requirements and collating
these requirements in a specification, together with a list of the means of assuring the
achievement of the dependability requirements.
The guidance provided includes:
• specifying quantitative and qualitative reliability, maintainability, supportability and
availability requirements;
• advising acquirers on how to ensure that the requirements can be fulfilled by suppliers;
• advising suppliers to help them meet the acquirer's requirements.
Other obligations, such as legislation and governmental regulations, can also place
requirements on items, in addition to any requirements derived in accordance with this
document.
Whilst mainly addressing system and equipment level dependability, many of the techniques
described in the various dependability related IEC standards can also be applied to products or
at the component level. The term "item" is used throughout this document.
This guidance is given in a basic project context where an acquirer obtains an item from a
supplier. It can be modified and adapted to other situations as needed.
NOTE 1 This document does not directly consider safety and environment specifications although much of the
guidance in this document could also be applied to them.
NOTE 2 This document does not cover items with special multi-stakeholder long-term arrangements (e.g. services
provided through Public-Private Partnership procurements) and how dependability is specified in such arrangements.
NOTE 3 The guidance in this document can be applied to some aspects of the specification of requirements relating
to software but specific guidance can be found in IEC 62628 [5] and the different parts of the IEC 61508 series [6].
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60050-192, International Electrotechnical Vocabulary (IEV) – Part 192: Dependability
(available at http://www.electropedia.org)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-192 and the
following apply.
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IEC 60300-3-4:2022 © IEC 2022 – 9 –
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
NOTE Definitions of "dependability", "availability", "reliability", "maintainability", "supportability”, "failure", "fault",
“time to failure", "operating time between failures", "verification" and "validation" are given in IEC 60050-192.
3.1
goal
statement which translates or expresses desires or aspirations and for which evidence of
fulfilment either need not or cannot be provided
3.2
item
subject being considered
Note 1 to entry: The item may be an individual part, component, device, functional unit, equipment, subsystem, or
system.
Note 2 to entry: The item may consist of hardware, software, people or any combination thereof.
Note 3 to entry: The item is often comprised of elements that may each be individually considered.
[SOURCE: IEC 60050-192:2015, 192-01-01, modified – Note 3 modified by omission of internal
references and Notes 4 and 5 deleted.]
3.3
off-the-shelf
OTS
non-developmental item of supply that is both commercial and sold in substantial quantities in
the commercial marketplace
Note 1 to entry: Sometimes referred to as COTS (commercial off-the-shelf) or MOTS (modified off-the-shelf).
3.4
requirement
statement which translates or expresses a need and its associated constraints and conditions
Note 1 to entry: Requirements exist at different levels in the system structure.
Note 2 to entry: A requirement is an expression of one or more particular needs in a very specific, precise and
unambiguous manner.
Note 3 to entry: A requirement always relates to a system, product or service, or other item of interest.
Note 4 to entry: A requirement is a statement where evidence or assurance of compliance can be provided.
[SOURCE: ISO/IEC/IEEE 29148:2018, 3.1.19 [7], modified – Note 4 added.]
3.5
specification
information item that identifies the dependability requirements and goals of
a system, product or service together with any supporting information
Note 1 to entry: Supporting information can include details of use, operating and environmental conditions, failure
criteria and the methods intended to be applied for assurance of compliance with the requirements, including
accept/reject criteria.
Note 2 to entry: ISO/IEC/IEEE 15289 [8] defines specification as an information item that identifies in a complete,
precise and verifiable manner the requirements, design, behaviour or other expected characteristics of the system,
service or process. The specification of dependability has a greater scope than that used in ISO/IEC/IEEE 15289.
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3.6
useful life
time interval from first use until user requirem
...
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