EN IEC 60300-1:2024

SLOVENSKI STANDARD
01-september-2024
Vodenje zagotovljivosti - 1. del: Upravljanje zagotovljivosti (IEC 60300-1:2024)
Dependability management - Part 1: Managing dependability (IEC 60300-1:2024)
Zuverlässigkeitsmanagement - Teil 1: Management von Zuverlässigkeit (IEC 60300-
1:2024)
Gestion de la sûreté de fonctionnement - Partie 1: Gestion de la sûreté de
fonctionnement (IEC 60300-1:2024)
Ta slovenski standard je istoveten z: EN IEC 60300-1:2024
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60300-1

NORME EUROPÉENNE
EUROPÄISCHE NORM August 2024
ICS 03.120.01; 03.100.40; 21.020 Supersedes EN 60300-1:2014
English Version
Dependability management - Part 1: Managing dependability
(IEC 60300-1:2024)
Gestion de la sûreté de fonctionnement - Partie 1: Gérer la Zuverlässigkeitsmanagement - Teil 1: Management von
sureté de fonctionnement Zuverlässigkeit
(IEC 60300-1:2024) (IEC 60300-1:2024)
This European Standard was approved by CENELEC on 2024-07-16. 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,
Türkiye 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60300-1:2024 E

European foreword
The text of document 56/2031/FDIS, future edition 4 of IEC 60300-1, prepared by IEC/TC 56
"Dependability" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-04-16
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-07-16
document have to be withdrawn
This document supersedes EN 60300-1:2014 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 60300-1:2024 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 standard indicated:
IEC 31010 NOTE Approved as EN IEC 31010
IEC 60300-3-1 NOTE Approved as EN 60300-3-1
IEC 60300-3-2 NOTE Approved as EN 60300-3-2
IEC 60300-3-3 NOTE Approved as EN 60300-3-3
IEC 60300-3-4 NOTE Approved as EN IEC 60300-3-4
IEC 60300-3-11 NOTE Approved as EN 60300-3-11
IEC 60300-3-12 NOTE Approved as EN 60300-3-12
IEC 60300-3-14 NOTE Approved as EN 60300-3-14
IEC 60300-3-16 NOTE Approved as EN 60300-3-16
IEC 60706-2 NOTE Approved as EN 60706-2
IEC 60706-3 NOTE Approved as EN 60706-3
IEC 60706-5 NOTE Approved as EN 60706-5
IEC 60812 NOTE Approved as EN IEC 60812
IEC 61014 NOTE Approved as EN 61014
IEC 61025 NOTE Approved as EN 61025
IEC 61078 NOTE Approved as EN 61078
IEC 61123 NOTE Approved as EN IEC 61123
IEC 61124 NOTE Approved as EN IEC 61124
IEC 61163-1 NOTE Approved as EN 61163-1
IEC 61163-2 NOTE Approved as EN IEC 61163-2
IEC 61165 NOTE Approved as EN 61165
IEC 61649 NOTE Approved as EN 61649
IEC 61703 NOTE Approved as EN 61703
IEC 61709 NOTE Approved as EN 61709
IEC 61710 NOTE Approved as EN 61710
IEC 61709 NOTE Approved as EN 61709
IEC 61710 NOTE Approved as EN 61710
IEC 61882 NOTE Approved as EN 61882
IEC 61907 NOTE Approved as EN 61907
IEC 62198 NOTE Approved as EN 62198
IEC 62308 NOTE Approved as EN 62308
IEC 62309 NOTE Approved as EN 62309
IEC 62402 NOTE Approved as EN IEC 62402
IEC 62502 NOTE Approved as EN 62502
IEC 62506 NOTE Approved as EN IEC 62506
IEC 62508 NOTE Approved as EN 62508
IEC 62550 NOTE Approved as EN 62550
IEC 62551 NOTE Approved as EN 62551
IEC 62628 NOTE Approved as EN 62628
IEC 62673 NOTE Approved as EN 62673
IEC 62740 NOTE Approved as EN 62740
IEC 62741:2015 NOTE Approved as EN 62741:2015 (not modified)
IEC 62853 NOTE Approved as EN IEC 62853
IEC 62960 NOTE Approved as EN IEC 62960
IEC 80001-1 NOTE Approved as EN IEC 80001-1
ISO 9001 NOTE Approved as EN ISO 9001
ISO 9241-210:2019 NOTE Approved as EN ISO 9241-210:2019 (not modified)
ISO 20815 NOTE Approved as EN ISO 20815
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-192 2015 International electrotechnical vocabulary - - -
Part 192: Dependability
IEC 60300-1 ®
Edition 4.0 2024-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Dependability management –
Part 1: Managing dependability

Gestion de la sûreté de fonctionnement –

Partie 1: Gérer la sureté de fonctionnement

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 03.100.40, 03.120.01, 21.020 ISBN 978-2-8322-8320-2

– 2 – IEC 60300-1:2024 © IEC 2024
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions, and abbreviated terms . 8
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 14
4 Key concepts and application of this document . 14
4.1 Overview. 14
4.2 Principles of dependability management . 14
4.3 Benefits of managing dependability . 15
4.4 Attributes of dependability . 16
4.5 Relationship between an organization's management system and
dependability . 18
4.6 Technical programmes for dependability . 19
4.7 Life cycle concept . 20
4.8 Dependability activity concept . 21
5 Integrating dependability into an organization's management system . 21
5.1 Overview. 21
5.2 Understanding the organization and its context . 22
5.3 Leadership . 22
5.4 Planning . 23
5.5 Support . 23
5.6 Documented information . 24
5.7 Operation . 25
5.8 Performance evaluation and improvement. 25
6 Programme design . 26
6.1 General . 26
6.2 Coordination and integration . 26
6.3 Trade-offs . 27
6.4 Tailoring a technical programme of dependability activities . 27
6.5 Key success factors . 28
7 Programme management activities . 28
7.1 Overview. 28
7.2 Plan dependability activities . 29
7.2.1 Purpose . 29
7.2.2 Outcomes . 29
7.2.3 Tasks . 29
7.3 Implement the plan . 31
7.3.1 Purpose . 31
7.3.2 Outcomes . 31
7.3.3 Tasks . 31
7.4 Review and improve . 32
7.4.1 Purpose . 32
7.4.2 Outcomes . 32
7.4.3 Tasks . 32

IEC 60300-1:2024 © IEC 2024 – 3 –
7.5 Providing assurance . 33
7.5.1 Purpose . 33
7.5.2 Outcomes . 33
7.5.3 Tasks . 33
7.6 Achieving accountability . 34
7.6.1 Purpose . 34
7.6.2 Outcomes . 34
7.6.3 Tasks . 34
8 Technical dependability activities. 35
8.1 Overview. 35
8.2 Stakeholder engagement, consensus building and communication . 35
8.2.1 Purpose . 35
8.2.2 Outcomes . 36
8.2.3 Tasks . 36
8.3 Managing opportunities, threats and risks . 37
8.3.1 Purpose . 37
8.3.2 Outcomes . 37
8.3.3 Tasks . 38
8.4 Dependability analysis . 38
8.4.1 Purpose . 38
8.4.2 Outcomes . 39
8.4.3 Tasks . 39
8.5 Dependability assessment . 40
8.5.1 Purpose . 40
8.5.2 Outcomes . 40
8.5.3 Tasks . 41
8.6 Maintenance, support and improvement . 41
8.6.1 Purpose . 41
8.6.2 Outcomes . 42
8.6.3 Tasks . 42
Annex A (informative) IEC standards related to dependability . 44
Annex B (informative) Life cycle models. 47
B.1 Generic life cycle . 47
B.2 Alternative life cycle models . 48
B.2.1 Life cycle model with multiple progressions . 48
B.2.2 Managing change through the life cycle . 48
B.2.3 Hardware . 49
B.2.4 Software (see Figure B.5) . 49
B.2.5 Services . 50
B.2.6 Open systems . 50
Annex C (informative) Stakeholders . 51
C.1 General . 51
C.2 Users of systems, products and services . 51
C.3 Managers . 51
C.4 The workforce . 51
C.5 Specialists . 52
C.6 Others. 52
C.7 Stakeholders through the life cycle . 52

– 4 – IEC 60300-1:2024 © IEC 2024
C.7.1 Concept – Specification . 52
C.7.2 Development . 52
C.7.3 Realization (including manufacture, transport acquisition and
installation) . 52
C.7.4 Operation or use of items . 53
C.7.5 Maintenance . 53
C.7.6 Obsolescence, retirement and re-use . 53
Annex D (informative) Dependability maturity assessment . 54
Annex E (informative) Dependability through the life cycle . 57
Annex F (informative) Comparison of approach of ISO/IEC/IEEE 15288 with that of
IEC 60300-1 . 60
F.1 Overview. 60
F.2 Concept of system life cycle processes . 60
Annex G (informative) Testing. 64
G.1 General . 64
G.2 Purpose and objectives of tests . 64
G.3 Test conditions . 64
G.4 Types of test . 65
G.5 Data quality and quantity . 66
Bibliography . 68

Figure 1 – Dependability and security attributes . 18
Figure 2 – Relationship between management system standards and dependability
standards . 19
Figure 3 – Integration of dependability into a management system . 22
Figure B.1 – Generic life cycle model . 47
Figure B.2 – Life cycle model with some of the possible progressions . 48
Figure B.3 – Managing change through the life cycle . 49
Figure B.4 – Example of hardware life cycle model . 49
Figure B.5 – Example of software life cycle model . 50
Figure B.6 – Example of service life cycle model . 50
Figure B.7 – Simplified life cycle model for an open system . 50
Figure F.1 – System life cycle processes according to ISO/IEC/IEEE 15288 . 61
Figure G.1 – Verification and validation methods or practices . 65

Table A.1 – Classification of dependability standards by topic and life cycle stage . 44
Table B.1 – Stages of generic model, their purpose and outputs . 47
Table D.1 – Example of dependability maturity matrix . 54
Table E.1 – Examples of dependability focus relevant to each life cycle stage . 57
Table F.1 – Comparison of approach of ISO/IEC/IEEE 15288 and IEC 60300-1 . 62

IEC 60300-1:2024 © IEC 2024 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
DEPENDABILITY MANAGEMENT –
Part 1: Managing dependability

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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 60300-1 has been prepared by IEC technical committee 56: Dependability. It is an
International Standard.
This fourth edition cancels and replaces the third edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) more guidance on integration of dependability activities into an existing management
system;
b) greater detail on the activities required to establish and implement a programme of
dependability activities;
c) changes to provide consistency with other dependability standards.

– 6 – IEC 60300-1:2024 © IEC 2024
The text of this International Standard is based on the following documents:
Draft Report on voting
56/2031/FDIS 56/2044/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/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, or
• revised.
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.

IEC 60300-1:2024 © IEC 2024 – 7 –
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 needs
and expectations. Dependability has many attributes but is usually characterised in terms of
reliability, maintainability and supportability, and the resulting availability. In some cases,
attributes such as resilience, recoverability, durability, integrity, safety, security, and
trustworthiness are included in, or overlap with, dependability.
The specification and verification of dependability attributes provide stakeholders with
assurance that requirements will be met into the future and quality will be maintained over time.
The dependability of a system, product or service influences the business strategies associated
with its design, acquisition and use, and costs over its life cycle. The dependability of an
organization's systems, products and services has a strong impact on the perception of the
value and trustworthiness of the organization.
Dependability is managed as a key element of an organization's wider management system,
particularly aspects relating to assets, quality and finance.
This document highlights the importance and benefits of managing dependability. It gives
guidance on dependability activities and their integration into an existing management system
and life cycle processes so that an efficient, effective and economical approach is achieved.
Dependability activities bring benefits whenever they are performed but greater benefit is
achieved the sooner in the life cycle they are implemented.
This document is applicable to a broad range of industry sectors and organizations of any size.
It applies to systems of systems, large unique systems, mass produced industrial and consumer
products, software applications, components and services. These categories are not mutually
exclusive. For example, many products and components are in themselves complex systems.
The document will be useful for:
• managers and technical personnel;
• those involved in deciding how their systems, products and services can be made
dependable;
• organizations such as regulators who evaluate the dependability of systems, products and
services;
• those (e.g. users or the public) who need justified confidence in systems, product and
services that might affect them;
• developers of other dependability related standards.
This document is one of a suite of "top level" interrelated IEC dependability standards that
provide managers and technical personnel with guidance on how to effectively plan and
implement dependability activities. Other documents in the suite are:
– IEC 60300-3-4 which provides guidance on writing dependability requirements in
specifications, and on the means of assuring the achievement of those requirements;
– IEC 60300-3-10 and IEC 60300-3-14 which provide guidance on how to identify and apply
appropriate analysis and assurance techniques for maintainability (and maintenance) and
supportability (and support) respectively;
– standards to cover reliability and availability, which are planned.

– 8 – IEC 60300-1:2024 © IEC 2024
DEPENDABILITY MANAGEMENT –
Part 1: Managing dependability

1 Scope
This document provides guidance on:
• the meaning and significance of dependability from a business, technical and financial
perspective;
• achieving dependability through suitable adaptation of organizational management systems
such as those described in ISO 9001 (quality management) and ISO 55001 (asset
management);
• the activities that are integrated into management systems and life cycle processes in order
to achieve dependable systems, products and services;
• planning and implementing dependability activities throughout the life cycle to achieve and
assure required outcomes, taking into account factors such as costs, safety, the
environment, customer goodwill, brand and reputation.
This document is applicable to any type of system, both new and existing, to mass produced
industrial or consumer products, to components and to services. This document addresses all
elements of systems, products and services including hardware, software, data, processes,
procedures, facilities, materials, and personnel required for operations and support.
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 60050-192:2015, International Electrotechnical Vocabulary (IEV) – Part 192: Dependability
(available at www.electropedia.org)
3 Terms, definitions, and abbreviated terms
For the purposes of this document, the terms and definitions given in IEC 60050-192 and the
following apply.
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

IEC 60300-1:2024 © IEC 2024 – 9 –
3.1 Terms and definitions
3.1.1
accountability
state of being answerable for decisions and activities to the organization's governing bodies,
legal authorities and, more broadly, its stakeholders and society in general
Note 1 to entry: Accountability involves an obligation on management, the organization and individuals to be
answerable for the impact of their decisions and activities on stakeholders, society and the environment.
Accountability thus implies answerability to those affected and to society in general.
Note 2 to entry: Accountability implies that individuals, organizations and the community are responsible for their
actions and can be required to justify them to others.
[SOURCE: ISO 26000:2010, 2.1, modified – "and society in general" has been added to the
definition and notes to entry have been added.]
3.1.2
adaptability
ability to adjust to changed conditions or to be modified for a particular purpose or for a changed
environment
3.1.3
assurance
grounds for justified confidence that a claim has been or will be achieved
[SOURCE: ISO/IEC/IEEE 15026-1:2019, 3.1.1]
3.1.4
availability
ability to be in a state to perform as required under given conditions
Note 1 to entry: Availability depends upon the combined attributes of the reliability, maintainability, supportability
and on the maintenance and support provided.
Note 2 to entry: Availability can also be affected by delays before it is recognised that maintenance or support are
needed, for example fault detection time (192-06-18) and administrative delay (192-07-12).
Note 3 to entry: Given conditions include aspects that affect availability such as mode of operation, stress levels,
environmental conditions and maintenance defined in the life profile.
Note 4 to entry: Availability may be quantified using measures defined in IEC 60050-192:2015, 192-08, Availability
related measures.
[SOURCE: IEC 60050-192:2015, 192-01-23, modified – in the definition "of an item" has been
deleted, "under given conditions" has been added, Note 1 to entry has been modified, and Notes
2 and 3 to entry have been added.]
3.1.5
business process
partially ordered set of inter-related enterprise activities that can be executed to achieve some
desired end-result in pursuit of a given objective of an organization
Note 1 to entry: Business is interpreted broadly to mean those activities that are core to the purposes of the
organization's existence whether the organization is public, private, for profit or not for profit.
[SOURCE: ISO/IEC/IEEE 24765:2017, 3.445, modified – Note 1 to entry has been added.]

– 10 – IEC 60300-1:2024 © IEC 2024
3.1.6
dependability
ability to perform as and when required
Note 1 to entry: A dependable item or service is one where there is justified confidence that it operates as desired
and satisfies agreed stakeholder expectations.
Note 2 to entry: In most cases, the term dependability is used as an umbrella term to express its core attributes of
reliability, maintainability, and supportability and the resulting availability. In some cases, attributes such as
resilience, recoverability, durability, integrity, safety, security and trustworthiness are included in or overlap with
dependability.
Note 3 to entry: In order to express the ability to perform, requirements in terms of functions to be performed, when
the performance is to be achieved, and the life profile conditions, are specified by the customers, users or
stakeholders.
Note 4 to entry: The attributes of dependability can be expressed qualitatively or quantitatively.
Note 5 to entry: It is also a common practice to use the term dependability in the context of a subject of study or
discipline.
[SOURCE: IEC 60050-192:2015, 192-01-22, modified – "of an item" has been deleted, the notes
have been deleted and new notes to entry have been added.]
3.1.7
dependability activity
set of cohesive tasks carried out to achieve a dependability related purpose
Note 1 to entry: A dependability activity can be mapped to a process view that uses a combination of life cycle
processes, activities and tasks as defined in ISO/IEC/IEEE 15288.
3.1.8
dependability case
evidence-based, reasoned, traceable argument created to support the contention that a defined
system does and/or will satisfy the dependability requirements
Note 1 to entry: A dependability case is an assurance case for dependability-related claims, see
ISO/IEC/IEEE 15026-2.
[SOURCE: IEC 62741:2015, 3.1.1, modified – Note 1 to entry has been added.]
3.1.9
dependability plan
information item that presents a systematic course of action for achieving a declared purpose
related to dependability including when, how and by whom specific tasks are to be performed
3.1.10
durability
ability to perform as required, under defined conditions of use and maintenance until a defined
end state is reached
Note 1 to entry: The degree to which maintenance and repair are within the scope of durability will vary by product
or product group.
Note 2 to entry: The end state can be based on technological, social or economic aspects.
Note 3 to entry: Durability can be expressed in units appropriate to the part or product concerned, e.g. calendar
time, operating cycles, distance run, etc. or the probability of being able to achieve a given period of usage. The
units should always be clearly stated.
Note 4 to entry: Durability as a measure relates to the longevity of the interval.
[SOURCE: IEC 60050-192:2015, 192-01-21, modified – "end of useful life" has been replaced
with "defined end state", and notes to entry have been added.]

IEC 60300-1:2024 © IEC 2024 – 11 –
3.1.11
integrity
ability to prevent or withstand unauthorised modification
Note 1 to entry: Modification can involve hardware, software or data.
3.1.12
life profile
stresses and their levels, content, duration and sequence encountered during the life of an item
Note 1 to entry: Stresses can be internal (such as operating cycles) or external (such as environmental stress, input
power level, or rate of service requests over a network).
Note 2 to entry: Life profile can be actual, expected or predicted.
3.1.13
maintainability
ability to be retained in, or restored to a state to perform as required, under given conditions
Note 1 to entry: Given conditions include location for maintenance, accessibility, maintenance procedures and
maintenance resources as well as conditions defined in the life profile.
Note 2 to entry: Maintainability can be quantified using appropriate measures. See IEC 60050-192:2015, 192-07,
Maintainability and maintenance support measures.
3.1.14
measurement
process of experimentally obtaining one or more values that can reasonably be attributed to a
quantity
Note 1 to entry: Measurement does not apply to nominal properties.
Note 2 to entry: Measurement implies comparison of quantities, including counting of entities.
Note 3 to entry: Measurement presupposes a description of the quantity commensurate with the intended use of a
measurement result, a measurement procedure, and a calibrated measuring system operating according to the
specified measurement procedure, including the measurement conditions.
Note 4 to entry: The French word "mesure" has several meanings in everyday French language. It is for this reason
that the French word "mesurage" has been introduced to describe the act of measurement. Nevertheless, the French
word "mesure" occurs many times in forming terms, following current usage, and without ambiguity. Examples are:
unité de mesure (unit of measurement), méthode de mesure (measurement method), instrument de mesure
(measurement instrument). This does not mean that the use of the French word "mesurage" in place of "mesure" in
such terms is not permissible when advantageous.
[SOURCE: ISO/IEC GUIDE 99:2007, 2.1, modified – Note 4 to entry has been added.]
3.1.15
need
prerequisite identified as necessary, to achieve an intended outcome, implied or stated, within
a specific context of use
– 12 – IEC 60300-1:2024 © IEC 2024
3.1.16
reliability
ability to perform as required, without failure, for a given interval under given conditions
Note 1 to entry: The interval can be expressed in units appropriate to the item concerned, for example calendar
time, operating cycles, distance run, etc., and the units should always be clearly stated.
Note 2 to entry: Given conditions include aspects that affect reliability such as: mode of operation, stress levels,
environmental conditions and maintenance.
Note 3 to entry: Reliability can be quantified using measures defined in IEC 60050-192:2015, 192-05, Reliabi
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