ISO/IEC/IEEE 32430:2021
(Main)Software engineering — Trial use standard for software non-functional sizing measurements
Software engineering — Trial use standard for software non-functional sizing measurements
This document defines a method for the sizing of non-functional software requirements. It complements ISO/ IEC 20926:2009, which defines a method for the sizing of functional user requirements (FUR).1 This document also describes the complementarity of functional and non-functional sizes, so that sizing both functional and non-functional requirements (NFR) do not overlap. It also describes how non-functional size, together with functional size, should be used for measuring the performance of software projects, setting benchmarks, and estimating the cost and duration of software projects. In general, there are many types of non-functional software requirements. Moreover, non-functional aspects evolve over time and may include additional aspects in the as technology advances. This standard does not intend to define the type of NFR for a given context. Users may choose ISO 25010:2011 or any other standard for the definition of NFR. It is assumed that users will size the NFR based on the definitions they use. This document covers a subset of non-functional types. It is expected that, with time, the state of the art can improve and that potential future versions of this standard can define an extended coverage. The ultimate goal is a version that, together with ISO/IEC 20926:2009, covers every aspect that may be required of any prospective piece of software, including aspects such as process and project directives that are hard or impossible to trace to the software's algorithm or data. The combination of functional and non-functional size would then correspond to the total size necessary to bring the software into existence. Calculating the effort and duration of the implementation of the NFR is outside the scope of this standard.
Ingénierie du logiciel — Norme expérimentale pour la quantification des caractéristiques non fonctionnelles des logiciels
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INTERNATIONAL ISO/IEC/
STANDARD IEEE
First edition
2021-10
Software engineering — Trial use
standard for software non-functional
sizing measurements
Ingénierie du logiciel — Norme expérimentale pour la quantification
des caractéristiques non fonctionnelles des logiciels
Reference number
© IEEE 2019
© IEEE 2019
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 IEEE at the address below.
Institute of Electrical and Electronics Engineers, Inc
3 Park Avenue, New York
NY 10016-5997, USA
Email: stds.ipr@ieee.org
Website: www.ieee.org
Published in Switzerland
ii
© IEEE 2019 – All rights reserved
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
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/IEC documents 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 or
www.iec.ch/members_experts/refdocs).
IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating
Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its
standards through a consensus development process, approved by the American National Standards
Institute, which brings together volunteers representing varied viewpoints and interests to achieve the
final product. Volunteers are not necessarily members of the Institute and serve without compensation.
While the IEEE administers the process and establishes rules to promote fairness in the consensus
development process, the IEEE does not independently evaluate, test, or verify the accuracy of any of the
information contained in its standards.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see patents.iec.ch).
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. In the IEC, see www.iec.ch/understanding-standards.
ISO/IEC/IEEE 32430 was prepared by the Systems and Software Engineering Standards Committee of
the IEEE Computer Society (as IEEE Std 2430-2019) and drafted in accordance with its editorial rules. It
was adopted, under the “fast-track procedure” defined in the Partner Standards Development
Organization cooperation agreement between ISO and IEEE, by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 7, Software and systems engineering.
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 and www.iec.ch/national-
committees.
© IEEE 2019 – All rights reserved iii
IEEE Std 2430™-2019
IEEE Trial-Use Standard for Software
Non-Functional Sizing Measurements
Developed by the
Software & Systems Engineering Standards Committee (C/S2ESC)
of the
IEEE Computer Society
Approved 13 June 2019
IEEE-SA Standards Board
Abstract: A method for the sizing of nonfunctional software requirements is defined in this
standard. It complements ISO/IEC 20926:2009, which defines a method for the sizing of functional
user requirements. Non-functional categories for data operations, interface design, technical
environment, and architecture software are included in this standard.Steps to determine and
calculate the non-functional size are also included. Handling requirements involving both functional
and non-functional requirements are explained in this standard, which also covers how to apply
non-functional sizing estimates in terms of cost, project duration and quality, and considerations of
software performance in terms of productivity and quality. The combination of functional and non-
functional size should correspond to the total size necessary to produce the software. The functional
size and non-functional size are orthogonal, and both are needed when sizing the software. The
complementarity of the functional and the non-functional sizes, to avoid overlaps or gaps between
the two size methods, are described in this standard. Calculating the implementation work effort
and duration of the non-functional requirements is outside the scope of this standard.
Keywords: IEEE 2430™, IFPUG, non-functional size measurements, non-functional requirements,
SNAP
The Institute of Electrical and Electronics Engineers, Inc.
3 Park Avenue, New York, NY 10016-5997, USA
All rights reserved. Published 16 October 2019. Printed in the United States of America.
IEEE is a registered trademark in the U.S. Patent & Trademark Office, owned by The Institute of Electrical and Electronics Engineers,
Incorporated.
W3C is trademarks or registered trademarks of the W3C®, (registered in numerous countries) World Wide Web Consortium. Marks of W3C
are registered and held by its host institutions: Massachusetts Institute of Technology (MIT), European Research Consortium for Information
and Mathematics (ERCIM), and Keio University, Japan.
PDF: ISBN 978-1-5044-5987-7 STD23763
Print: ISBN 978-1-5044-5988-4 STDPD23763
IEEE prohibits discrimination, harassment, and bullying.
For more information, visit https:// www.ieee .org/ web/ aboutus/ whatis/ policies/ p9 -26 .html.
No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission
of the publisher.
Important Notices and Disclaimers Concerning IEEE Standards Documents
IEEE documents are made available for use subject to important notices and legal disclaimers. These notices
and disclaimers, or a reference to this page, appear in all standards and may be found under the heading
“Important Notices and Disclaimers Concerning IEEE Standards Documents.” They can also be obtained on
request from IEEE or viewed at https://standards .ieee.or g/ ipr/ disclaimers.html .
Notice and Disclaimer of Liability Concerning the Use of IEEE Standards
Documents
IEEE Standards documents (standards, recommended practices, and guides), both full-use and trial-use,
are developed within IEEE Societies and the Standards Coordinating Committees of the IEEE Standards
Association (“IEEE-SA”) Standards Board. IEEE (“the Institute”) develops its standards through a consensus
development process, approved by the American National Standards Institute (“ANSI”), which brings
together volunteers representing varied viewpoints and interests to achieve the final product. IEEE Standards
are documents developed through scientific, academic, and industry-based technical working groups.
Volunteers in IEEE working groups are not necessarily members of the Institute and participate without
compensation from IEEE. While IEEE administers the process and establishes rules to promote fairness in the
consensus development process, IEEE does not independently evaluate, test, or verify the accuracy of any of
the information or the soundness of any judgments contained in its standards.
IEEE Standards do not guarantee or ensure safety, security, health, or environmental protection, or ensure
against interference with or from other devices or networks. Implementers and users of IEEE Standards
documents are responsible for determining and complying with all appropriate safety, security, environmental,
health, and interference protection practices and all applicable laws and regulations.
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are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to
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issued is subject to change brought about through developments in the state of the art and comments received
from users of the standard.
In publishing and making its standards available, IEEE is not suggesting or rendering professional or other
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OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE PUBLICATION, USE OF, OR RELIANCE
UPON ANY STANDARD, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE AND
REGARDLESS OF WHETHER SUCH DAMAGE WAS FORESEEABLE.
Authorized licensed use limited to: IEEE Standards Board BoG CAG SASB RAC. Downloaded on October 28,2019 at 15:50:29 UTC from IEEE Xplore. Restrictions apply.
Translations
The IEEE consensus development process involves the review of documents in English only. In the event that
an IEEE standard is translated, only the English version published by IEEE should be considered the approved
IEEE standard.
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not be considered to be, or be relied upon as, a formal position of IEEE. At lectures, symposia, seminars, or
educational courses, an individual presenting information on IEEE standards shall make it clear that his or her
views should be considered the personal views of that individual rather than the formal position of IEEE.
Comments on standards
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of membership affiliation with IEEE. However, IEEE does not provide consulting information or advice
pertaining to IEEE Standards documents. Suggestions for changes in documents should be in the form of a
proposed change of text, together with appropriate supporting comments. Since IEEE standards represent a
consensus of concerned interests, it is important that any responses to comments and questions also receive
the concurrence of a balance of interests. For this reason, IEEE and the members of its societies and Standards
Coordinating Committees are not able to provide an instant response to comments or questions except in
those cases where the matter has previously been addressed. For the same reason, IEEE does not respond to
interpretation requests. Any person who would like to participate in revisions to an IEEE standard is welcome
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Comments on standards should be submitted to the following address:
Secretary, IEEE-SA Standards Board
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Piscataway, NJ 08854 USA
Laws and regulations
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compliance with applicable laws, and these documents may not be construed as doing so.
Copyrights
IEEE draft and approved standards are copyrighted by IEEE under US and international copyright laws. They
are made available by IEEE and are adopted for a wide variety of both public and private uses. These include
both use, by reference, in laws and regulations, and use in private self-regulation, standardization, and the
promotion of engineering practices and me
...
INTERNATIONAL ISO/IEC/
STANDARD IEEE
First edition
2021-10
Software engineering — Trial use
standard for software non-functional
sizing measurements
Ingénierie du logiciel — Norme expérimentale pour la quantification
des caractéristiques non fonctionnelles des logiciels
Reference number
© IEEE 2019
© IEEE 2019
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 IEEE at the address below.
Institute of Electrical and Electronics Engineers, Inc
3 Park Avenue, New York
NY 10016-5997, USA
Email: stds.ipr@ieee.org
Website: www.ieee.org
Published in Switzerland
ii
© IEEE 2019 – All rights reserved
Foreword
ISO (the International Organization for Standardization) and IEC (the International Electrotechnical
Commission) form the specialized system for worldwide standardization. National bodies that are
members of ISO or IEC participate in the development of International Standards through technical
committees established by the respective organization to deal with particular fields of technical activity.
ISO and IEC technical committees collaborate in fields of mutual interest. Other international
organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the
work.
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/IEC documents 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 or
www.iec.ch/members_experts/refdocs).
IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating
Committees of the IEEE Standards Association (IEEE-SA) Standards Board. The IEEE develops its
standards through a consensus development process, approved by the American National Standards
Institute, which brings together volunteers representing varied viewpoints and interests to achieve the
final product. Volunteers are not necessarily members of the Institute and serve without compensation.
While the IEEE administers the process and establishes rules to promote fairness in the consensus
development process, the IEEE does not independently evaluate, test, or verify the accuracy of any of the
information contained in its standards.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights. Details
of any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents) or the IEC list of patent
declarations received (see patents.iec.ch).
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. In the IEC, see www.iec.ch/understanding-standards.
ISO/IEC/IEEE 32430 was prepared by the Systems and Software Engineering Standards Committee of
the IEEE Computer Society (as IEEE Std 2430-2019) and drafted in accordance with its editorial rules. It
was adopted, under the “fast-track procedure” defined in the Partner Standards Development
Organization cooperation agreement between ISO and IEEE, by Joint Technical Committee ISO/IEC JTC 1,
Information technology, Subcommittee SC 7, Software and systems engineering.
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 and www.iec.ch/national-
committees.
© IEEE 2019 – All rights reserved iii
IEEE Std 2430™-2019
IEEE Trial-Use Standard for Software
Non-Functional Sizing Measurements
Developed by the
Software & Systems Engineering Standards Committee (C/S2ESC)
of the
IEEE Computer Society
Approved 13 June 2019
IEEE-SA Standards Board
Abstract: A method for the sizing of nonfunctional software requirements is defined in this
standard. It complements ISO/IEC 20926:2009, which defines a method for the sizing of functional
user requirements. Non-functional categories for data operations, interface design, technical
environment, and architecture software are included in this standard.Steps to determine and
calculate the non-functional size are also included. Handling requirements involving both functional
and non-functional requirements are explained in this standard, which also covers how to apply
non-functional sizing estimates in terms of cost, project duration and quality, and considerations of
software performance in terms of productivity and quality. The combination of functional and non-
functional size should correspond to the total size necessary to produce the software. The functional
size and non-functional size are orthogonal, and both are needed when sizing the software. The
complementarity of the functional and the non-functional sizes, to avoid overlaps or gaps between
the two size methods, are described in this standard. Calculating the implementation work effort
and duration of the non-functional requirements is outside the scope of this standard.
Keywords: IEEE 2430™, IFPUG, non-functional size measurements, non-functional requirements,
SNAP
The Institute of Electrical and Electronics Engineers, Inc.
3 Park Avenue, New York, NY 10016-5997, USA
All rights reserved. Published 16 October 2019. Printed in the United States of America.
IEEE is a registered trademark in the U.S. Patent & Trademark Office, owned by The Institute of Electrical and Electronics Engineers,
Incorporated.
W3C is trademarks or registered trademarks of the W3C®, (registered in numerous countries) World Wide Web Consortium. Marks of W3C
are registered and held by its host institutions: Massachusetts Institute of Technology (MIT), European Research Consortium for Information
and Mathematics (ERCIM), and Keio University, Japan.
PDF: ISBN 978-1-5044-5987-7 STD23763
Print: ISBN 978-1-5044-5988-4 STDPD23763
IEEE prohibits discrimination, harassment, and bullying.
For more information, visit https:// www.ieee .org/ web/ aboutus/ whatis/ policies/ p9 -26 .html.
No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission
of the publisher.
Important Notices and Disclaimers Concerning IEEE Standards Documents
IEEE documents are made available for use subject to important notices and legal disclaimers. These notices
and disclaimers, or a reference to this page, appear in all standards and may be found under the heading
“Important Notices and Disclaimers Concerning IEEE Standards Documents.” They can also be obtained on
request from IEEE or viewed at https://standards .ieee.or g/ ipr/ disclaimers.html .
Notice and Disclaimer of Liability Concerning the Use of IEEE Standards
Documents
IEEE Standards documents (standards, recommended practices, and guides), both full-use and trial-use,
are developed within IEEE Societies and the Standards Coordinating Committees of the IEEE Standards
Association (“IEEE-SA”) Standards Board. IEEE (“the Institute”) develops its standards through a consensus
development process, approved by the American National Standards Institute (“ANSI”), which brings
together volunteers representing varied viewpoints and interests to achieve the final product. IEEE Standards
are documents developed through scientific, academic, and industry-based technical working groups.
Volunteers in IEEE working groups are not necessarily members of the Institute and participate without
compensation from IEEE. While IEEE administers the process and establishes rules to promote fairness in the
consensus development process, IEEE does not independently evaluate, test, or verify the accuracy of any of
the information or the soundness of any judgments contained in its standards.
IEEE Standards do not guarantee or ensure safety, security, health, or environmental protection, or ensure
against interference with or from other devices or networks. Implementers and users of IEEE Standards
documents are responsible for determining and complying with all appropriate safety, security, environmental,
health, and interference protection practices and all applicable laws and regulations.
IEEE does not warrant or represent the accuracy or content of the material contained in its standards, and
expressly disclaims all warranties (express, implied and statutory) not included in this or any other document
relating to the standard, including, but not limited to, the warranties of: merchantability; fitness for a particular
purpose; non-infringement; and quality, accuracy, effectiveness, currency, or completeness of material. In
addition, IEEE disclaims any and all conditions relating to: results; and workmanlike effort. IEEE standards
documents are supplied “AS IS” and “WITH ALL FAULTS.”
Use of an IEEE standard is wholly voluntary. The existence of an IEEE standard does not imply that there
are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to
the scope of the IEEE standard. Furthermore, the viewpoint expressed at the time a standard is approved and
issued is subject to change brought about through developments in the state of the art and comments received
from users of the standard.
In publishing and making its standards available, IEEE is not suggesting or rendering professional or other
services for, or on behalf of, any person or entity nor is IEEE undertaking to perform any duty owed by any
other person or entity to another. Any person utilizing any IEEE Standards document, should rely upon his or
her own independent judgment in the exercise of reasonable care in any given circumstances or, as appropriate,
seek the advice of a competent professional in determining the appropriateness of a given IEEE standard.
IN NO EVENT SHALL IEEE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO:
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE PUBLICATION, USE OF, OR RELIANCE
UPON ANY STANDARD, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE AND
REGARDLESS OF WHETHER SUCH DAMAGE WAS FORESEEABLE.
Authorized licensed use limited to: IEEE Standards Board BoG CAG SASB RAC. Downloaded on October 28,2019 at 15:50:29 UTC from IEEE Xplore. Restrictions apply.
Translations
The IEEE consensus development process involves the review of documents in English only. In the event that
an IEEE standard is translated, only the English version published by IEEE should be considered the approved
IEEE standard.
Official statements
A statement, written or oral, that is not processed in accordance with the IEEE-SA Standards Board Operations
Manual shall not be considered or inferred to be the official position of IEEE or any of its committees and shall
not be considered to be, or be relied upon as, a formal position of IEEE. At lectures, symposia, seminars, or
educational courses, an individual presenting information on IEEE standards shall make it clear that his or her
views should be considered the personal views of that individual rather than the formal position of IEEE.
Comments on standards
Comments for revision of IEEE Standards documents are welcome from any interested party, regardless
of membership affiliation with IEEE. However, IEEE does not provide consulting information or advice
pertaining to IEEE Standards documents. Suggestions for changes in documents should be in the form of a
proposed change of text, together with appropriate supporting comments. Since IEEE standards represent a
consensus of concerned interests, it is important that any responses to comments and questions also receive
the concurrence of a balance of interests. For this reason, IEEE and the members of its societies and Standards
Coordinating Committees are not able to provide an instant response to comments or questions except in
those cases where the matter has previously been addressed. For the same reason, IEEE does not respond to
interpretation requests. Any person who would like to participate in revisions to an IEEE standard is welcome
to join the relevant IEEE working group.
Comments on standards should be submitted to the following address:
Secretary, IEEE-SA Standards Board
445 Hoes Lane
Piscataway, NJ 08854 USA
Laws and regulations
Users of IEEE Standards documents should consult all applicable laws and regulations. Compliance with
the provisions of any IEEE Standards document does not imply compliance to any applicable regulatory
requirements. Implementers of the standard are responsible for observing or referring to the applicable
regulatory requirements. IEEE does not, by the publication of its standards, intend to urge action that is not in
compliance with applicable laws, and these documents may not be construed as doing so.
Copyrights
IEEE draft and approved standards are copyrighted by IEEE under US and international copyright laws. They
are made available by IEEE and are adopted for a wide variety of both public and private uses. These include
both use, by reference, in laws and regulations, and use in private self-regulation, standardization, and the
promotion of engineering practices and me
...
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