ISO/FDIS 24096-1

Technical product documentation (TPD) — Classification of requirements — Part 1: Framework

Documentation technique de produits (TPD) — Classification des exigences — Partie 1: Cadre

General Information

• Status: Not Published
• ICS: 01.100.01 - Technical drawings in general
• Technical Committee: ISO/TC 10/SC 6 - Mechanical engineering documentation
• Drafting Committee: ISO/TC 10/SC 6/WG 21 - Classification of technical requirements
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 28-May-2024
• Completion Date: 28-May-2024

Relations

• Consolidates: ISO/IEC 23360-2-3:2021 - Linux Standard Base (LSB) — Part 2-3: Desktop specification for X86-32 architecture
• Effective Date: 22-Apr-2023

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 10/SC 6
Technical product documentation
Secretariat: SAC
(TPD) — Classification of
Voting begins on:
requirements —
2024-05-28
Part 1:
Voting terminates on:
2024-07-23
Framework
Documentation technique de produits (TPD) — Classification des
exigences —
Partie 1: Cadre
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 10/SC 6
Technical product documentation
Secretariat: SAC
(TPD) — Classification of
Voting begins on:
requirements —
Part 1:
Voting terminates on:
Framework
Documentation technique de produits (TPD) — Classification des
exigences —
Partie 1: Cadre
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2024
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2  Normative references . 1
3  Terms and definitions . 1
4 Basic rules . 2
4.1 General .2
4.2 Description of requirement class .3
4.3 Use of a classification system .3
4.4 Application .3
4.5 Definition of classification levels .4
Annex A (informative)  Guidance for class implication and system application . 5
Annex B (informative)  Guidance for indication, definition of requirement classes and the
selection of symbols . 7
Annex C (informative)  Guidance for indication in technical product documentation and placing
of symbols . 9
Bibliography .12

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO 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, ISO 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
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO’s adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 10, Technical product documentation,
Subcommittee SC 6, Mechanical engineering documentation, in collaboration with the European Committee
for Standardization (CEN) Technical Committee CEN/SS F01, Technical drawings, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 24096 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
This document addresses the classification of requirements. It provides a framework for building a
system to enable the classification of requirements and an indication of the classification in the functional
specification, FUN-SPEC, to support communication of the consequences of nonconformity to functional
requirements. FUN-SPEC (see ISO/TS 21619) is a part of the technical product documentation (TPD). Other
approaches than classification of requirements can be state of the art in achieving the objective of securing
the end product.
This document has been developed mainly to be implemented within industry, e.g. the automotive and
aerospace industries. However, it can also be used in other engineering fields.
Classification of requirements is a tool by which subsequent parties and stakeholders can be informed of the
level of consequences of nonconformity of requirements. This facilitates the guiding of production and quality
assurance resources (e.g. purchasing, production planning, control, revision). The classification system
relies on established procedures, regulatory framework and contractual agreements for implementation
and follow up as present in all modern industry.
There are several examples of industrial stakeholders that deploy their own or partially self-developed
system and methodology for classification of requirements. There has previously not been any ISO document
that pragmatically describes “what is” and “how to create” a classification system. This series bridges the
identified gap and meets the need to describe how to introduce and work with a classification system in an
industrial and design context.
Knowledge of the consequences of nonconformity, with requirements and actions taken to resolve the source
of the deviation from the given requirements, will have a positive effect on product quality, user safety and
economy of the product. Production and inspection resources can then be used where they are most needed.
Annex A gives guidance for class implication and system application.
Annex B gives guidance for indication, definition of requirement classes and the selection of symbols.
Annex C gives guidance for indication in TPD and placing of symbols.

v
FINAL DRAFT International Standard ISO/FDIS 24096-1:2024(en)
Technical product documentation (TPD) — Classification of
requirements —
Part 1:
Framework
1 Scope
This document specifies a framework for building a system for the classification of requirements. Such a
system can be used to indicate requirements of special importance, communicate them for production set-
up, verification, audit, etc.
This document:
— gives background information why such a system is useful in many areas of manufacturing;
— can be referred to for the concept of classification of requirements;
— functions as a framework for applying such a system in technical product documentation (TPD);
— indicates the needed elements for a classification system;
— supports with aspects in the choice of symbols for a classification system.
As a framework, this document does not give the details of a specific classification system. Instead, it
functions as a basis for an organization-specific system which contains details such as notations and
symbols, classification levels, assessment procedures, etc., including usage and interpretation in the TPD.
This document does not specify the contractual consequences of a classification (e.g. needed actions such
as choice of tools, reliability index or process capability for a classification level) nor other references to
standards or documents for handling classifications and nonconformity to requirements.
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.
ISO 8015:2011, Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules
ISO 10209, Technical product documentation — Vocabulary — Terms relating to technical drawings, product
definition and related documentation
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8015:2011, ISO 10209 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/

3.1
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, software or service, or other item of interest.
[SOURCE: ISO/IEC/IEEE 29148:2018, 3.1.19]
3.2
requirement class
element in a technical product requirement (3.1) which indicates a level of severity (3.4)
Note 1 to entry: The lowest requirement class is called “baseline” and usually not marked in the technical product
documentation.
3.3
requirement classification system
organization of requirement classes (3.2) with described interdependencies and symbols
3.4
severity
gravity of possible consequence of nonconformity
4 Basic rules
4.1 General
The framework in this document describes the needed components in a comp
...

Date: 2024-03-15
ISO/TC 10/SC 6/WG 21
Secretariat: SAC
Date: 2024-05-06
Technical product documentation (TPD) — Classification of
requirements —
Part 1:
Framework
Documentation technique de produits (TPD) — Classification des exigences —
Partie 1: Cadre
FDIS stage
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
at the address below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
E-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic rules . 2
4.1 General . 2
4.2 Description of requirement class . 3
4.3 Use of a classification system . 3
4.4 Application . 3
4.5 Definition of classification levels . 4
Annex A (informative) Guidance for class implication and system application . 5
Annex B (informative) Guidance for indication, definition of requirement classes and the
selection of symbols . 7
B.1 General . 7
B.2 Basic symbols . 7
Annex C (informative) Guidance for indication in technical product documentation and placing
of symbols . 9
C.1 General . 9
C.2 Indication in TPD . 9
Bibliography . 12

iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO 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, ISO 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
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO’s adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 10, Technical product documentation,
Subcommittee SC 6, Mechanical engineering documentation, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/SS F01, Technical drawings, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 24096 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
This document addresses the classification of requirements. It provides a framework for building a system to
enable the classification of requirements and an indication of the classification in the functional specification,
FUN-SPEC, to support communication of the consequences of nonconformity to functional requirements. FUN-
SPEC, (see ISO/TS 21619,) is a part of the technical product documentation (TPD). Other approaches than
classification of requirements can be state of the art in achieving the objective of securing the end product.
This document has been developed mainly to be implemented within industry, e.g. the automotive and
aerospace industries. However, it can also be used in other engineering fields.
Classification of requirements is a tool by which subsequent parties and stakeholders can be informed of the
level of consequences of nonconformity of requirements. This facilitates the guiding of production and quality
assurance resources, (e.g. purchasing, production planning, control and, revision.). The classification system
relies on established procedures, regulatory framework and contractual agreements for implementation and
follow up as present in all modern industry.
There are several examples of industrial stakeholders that deploy their own or partially self-developed system
and methodology for classification of requirements. There has previously not been any ISO document that
pragmatically describes “what is” and “how to create” a classification system. This series bridges the identified
gap, and meets the needsneed to describe how to introduce and work with a classification system in an
industrial and design context.
Knowledge of the consequences of nonconformity, with requirements and actions taken to resolve the source
of the deviation from the given requirements, will have a positive effect on product quality, user safety and
economy of the product. Production and inspection resources can then be used where they are most needed.
Annex A gives guidance for class implication and system application.
Annex B gives guidance for indication, definition of requirement classes and the selection of symbols.
Annex C gives guidance for indication in TPD and placing of symbols.
v
Technical product documentation (TPD) — Classification of
requirements —
Part 1:
Framework
1 Scope
This document specifies a framework for building a system for the classification of requirements. Such a
system can be used to indicate requirements of special importance, communicate them for production set-up,
verification, audit, etc.
This document:
— gives background information why such a system is useful in many areas of manufacturing;
— can be referred to for the concept of classification of requirements;
— functions as a framework for applying such a system in technical product documentation (TPD);
— indicates the needed elements for a classification system;
— supports with aspects in the choice of symbols for a classification system.
As a framework, this document does not give the details of a specific classification system. Instead, it functions
as a basis for an organization-specific system which contains details such as notations and symbols,
classification levels, assessment procedures, etc., including usage and interpretation in the TPD.
This document does not specify the contractual consequences of a classification, (e.g. needed actions such as
choice of tools, reliability index or process capability for a classification level,) nor other references to
standards or documents for handling classifications and nonconformity to requirements.
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.
ISO 8015:2011, Geometrical product specifications (GPS) — Fundamentals — Concepts, principles and rules
ISO 10209, Technical product documentation — Vocabulary — Terms relating to technical drawings, product
definition and related documentation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8015:2011, ISO 10209 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/

3.1
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, software or service, or other item of interest.
[SOURCE: ISO/IEC/IEEE 29148:2018, 3.1.19]
3.2
requirement class
element in a technical product requirement (3.1) which indicates a level of severity (3.4)
Note 1 to entry: The lowest requirement class is called “Baselinebaseline” and usually not marked in the TPD. technical
product documentation.
3.3
requirement classification system
organization of requirement classes (3.2) with described interdependencies and symbols
3.4
severity
gravity of possible consequence of nonconformity
4 Basic rules
4.1 General
The framework in this document describes the needed components in a complete classification system.
With a classification system and through indication of classified requirements, it is possible to give
information about the consequences of nonconformity with these requirements. However, classification
systems based on this document doesdo not give exemptions to deviate from any requirements.
All requirements in the product documentation shall be fulfilled in accordance with ISO 8015:2011, 4.3 and
4.4.
A classification system is a tool to indicate critical requirements in order to facilitate quality assurance
downstream in the design departments.
A classification system shall contain a description of the indications (see Annex A for examples), criteria for
classification levels and an explanation on how to document a classification. A classification system can be
constructed with levels and/or types of consequences of nonconformity with requirements.
The design goal should always be to have a robust design, in which variations occurring in, for example,
production do not cause critical effects, and thereby render this type of marking redundant.
The requirements to be secured are usually customer requirements such as economy, safety and environment.
They are usually difficult to measure in production and therefore not suitable for production follow up and
quality control. Customer requirements on the product are met through product requirements (including
regulatory requirements). They in turn are met through functional requirements, characteristic requirements
and ultimately parameter requirements, see Figure 1.
ISO/FD
...