ISO/IEC/IEEE 29148:2018

INTERNATIONAL ISO/IEC/
STANDARD IEEE
Second edition
2018-11
Systems and software engineering —
Life cycle processes — Requirements
engineering
Ingénierie des systèmes et du logiciel — Processus du cycle de vie —
Ingénierie des exigences
Reference number
©
ISO/IEC 2018
©
IEEE 2018
© ISO/IEC 2018
© IEEE 2018
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© ISO/IEC 2018 – All rights reserved
ii © IEEE 2018 – All rights reserved

Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 7
4 Conformance . 8
4.1 Intended usage . 8
4.2 Full conformance. 8
4.3 Conformance to processes . 8
4.4 Conformance to information item content . 8
4.5 Tailored conformance . 9
4.5.1 Processes . 9
4.5.2 Information items . 9
5 Concepts . 9
5.1 General . 9
5.2 Requirements fundamentals . 9
5.2.1 General. 9
5.2.2 Stakeholders . 9
5.2.3 Transformation of needs into requirements .10
5.2.4 Requirements construct .10
5.2.5 Characteristics of individual requirements .12
5.2.6 Characteristics of a set of requirements .13
5.2.7 Requirement language criteria .14
5.2.8 Requirements attributes .14
5.3 Practical considerations .16
5.3.1 Application of iteration and recursion .16
5.3.2 Iteration and recursion in requirements engineering .17
5.4 Requirement information items .18
6 Processes .20
6.1 Requirement processes .20
6.1.1 Guidelines for processes .20
6.2 Business or mission analysis process . .21
6.2.1 Purpose .21
6.2.2 Outcomes .22
6.2.3 Activities and tasks .22
6.3 Stakeholder needs and requirements definition process .26
6.3.1 Purpose .26
6.3.2 Outcomes .26
6.3.3 Activities and tasks .26
6.4 System [System/Software] Requirements definition process .34
6.4.1 Purpose .34
6.4.2 Outcomes .35
6.4.3 Activities and tasks .35
6.5 Requirements engineering activities in other technical processes .41
6.5.1 Requirements activities in architecture definition.41
6.5.2 Requirements activities in verification.42
6.5.3 Requirements activities in validation .44
6.6 Requirements management .45
6.6.1 Management overview .45
6.6.2 Change management .46
© ISO/IEC 2018 – All rights reserved
© IEEE 2018 – All rights reserved iii

6.6.3 Measurement for requirements .48
7 Information items .50
8 Guidelines for information items .51
8.1 Requirements information item outlines .51
8.2 Business requirements specification .51
8.2.1 General.51
8.2.2 BRS example outline .51
8.3 Stakeholder requirements specification .52
8.3.1 General.52
8.3.2 StRS example outline .53
8.4 System requirements specification .54
8.4.1 General.54
8.4.2 SyRS example outline .54
8.5 Software requirements specification .55
8.5.1 General.55
8.5.2 SRS example outline .56
9 Information item content .57
9.1 General .57
9.2 General content .57
9.2.1 Identification .57
9.2.2 Front matter .57
9.2.3 Definitions .
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