ISO/IEC/IEEE 24765:2017

INTERNATIONAL ISO/IEC/
STANDARD IEEE
Second edition
2017-09
Systems and software engineering —
Vocabulary
Ingénierie des systèmes et du logiciel — Vocabulaire
Reference number
©
ISO/IEC 2017
©
IEEE 2017
© ISO/IEC 2017, Published in Switzerland
© IEEE 2017
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any
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ii © IEEE 2017 – All rights reserved

Contents Page
Foreword . v
Introduction .vi
1 Scope .1
1.1 General .1
1.2 Relationship of the print and internet-accessible versions .1
1.3 Vocabulary structure .1
1.4 PMI Glossary provisions .2
2 Normative references .2
3 Terms, definitions, and abbreviated terms .2
Annex A (informative)  List of References . 513
Bibliography . 514

iii
© ISO/IEC 2017 – All rights reserved
© IEEE 2017 – All rights reserved

List of Figures
Figure 1 — Activity group . 10
Figure 2 — Bathtub curve . 42
Figure 3 — Block diagram . 47
Figure 4 —Box Diagram . 50
Figure 5 —Bubble chart . 52
Figure 6 —Call graph . 56
Figure 7 —Case construct . 59
Figure 8 — Category . 60
Figure 9 — Data flow diagram .1 16
Figure 10 — Data structure diagram . 119
Figure 11 — Directed graph .1 40
Figure 12 — Documentation tree .1 44
Figure 13 — Flowchart .1 85
Figure 14 — If-then-else construct . 212
Figure 15 — Input-process-output chart . 225
Figure 16 — Modification request.2 78
Figure 17 — Structure chart .4 40
Figure 18 — UNTIL construct .4 87
Figure 19 — Waterfall model .5 06
Figure 20 — Website .5 07
Figure 21 — WHILE construct .5 08

iv
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© IEEE 2017 – 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
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established a joint technical committee, ISO/IEC JTC 1.
IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating Committees of
the IEEE Standards Association (IEEE­SA) Standards Board. The IEEE develops its standards through a consensus
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the accuracy of any of the information contained in its standards.
The procedures used to develop this document and those intended for its further maintenance are described in the
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(see www.iso.org/directives).
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This document was prepared by Technical Committee ISO/IEC JTC 1, Information technology, SC 7, Software and
systems engineering, in cooperation with the IEEE Computer Society Systems and Software Engineering Standards
Committee, under the Partner Standards Development Organization cooperation agreement between ISO and IEEE.
Certain material contained in ISO/IEC/IEEE 24765 is reproduced, with permission, from A Guide to the Project
Management Body of Knowledge (PMBOK®) Guide — Fifth Edition, copyright 2013, Project Management Institute.
This second edition cancels and replaces the first edition (ISO/IEC/IEEE 24765:2010), and has been editorially
revised. Revisions in terms and definitions published in this second edition have been previously approved through
the vocabulary maintenance procedures of ISO/IEC JTC 1/SC7, in cooperation with the IEEE Computer Society.
These revisions have been made available through the online vocabulary database used for this standard,
maintained by the ISO/IEC JTC 1/SC7/SWG 22 Vocabulary Validation Team in cooperation with the IEEE Computer
Society at www.computer.org/sevocab

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© IEEE 2017 – All rights reserved

Introduction
The systems and software engineering disciplines are continuing to mature while information technology
advances. New terms are being generated and new meanings are being adopted for existing terms. This
document was prepared to collect and standardize terminology. Its purpose is to identify terms currently in use
in the field and standard definitions for these terms. It is intended to serve as a useful reference for those in
the Information Technology field, and to encourage the use of systems and software engineering standards
prepared by ISO/IEC JTC 1 and liaison organizations IEEE Computer Society and Project Management Institute
(PMI). It provides definitions that are rigorous, uncomplicated, and understandable by all concerned.
While it is useful to find the meaning of a term, no word stands in isolation. This document makes it possible to
search for related concepts and to view how a term is used in definitions of other terms.
Every effort has been made to use definitions from established systems and software engineering standards of
ISO JTC 1/SC 7 and its liaison organizations IEEE Computer Society and the PMI. When existing standards
were found to be incomplete, unclear or inconsistent with other entries in the vocabulary, however, new, revised,
or composite definitions have been developed. Some definitions have been recast in a system, rather than software,
context.
The vocabulary is offered in both print and internet­accessible versions for ease of reference and to encourage use
of the source standards for the vocabulary. The online vocabulary database used for this standard is maintained by
the ISO/IEC JTC 1/SC7/SWG 22 Vocabulary Validation Team in cooperation with the IEEE Computer Society at
www.computer.org/sevocab
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© IEEE 2017 – All rights reserved

INTERNATIONAL STANDARD ISO/IEC/IEEE 247
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