ISO 21506:2024/Amd 1:2026

• Status: Published
• Publication Date: 14-Sep-2026
• ICS: 01.040.03 - Services. Company organization, management and quality. Administration. Transport. Sociology. (Vocabularies)
• ICS: 03.100.40 - Research and development
• Technical Committee: ISO/TC 258 - Project, programme and portfolio management
• Drafting Committee: ISO/TC 258 - Project, programme and portfolio management
• Current Stage: 6060 - International Standard published
• Start Date: 15-Sep-2026
• Due Date: 04-Mar-2027
• Completion Date: 15-Sep-2026

• Amends: ISO 21506:2024 - Project, programme and portfolio management — Vocabulary
• Effective Date: 06-Sep-2025

ISO 21506:2024/Amd.1:2026 is an ISO amendment to the Project, programme and portfolio management vocabulary standard. It revises two definitions - budget at completion and estimate at completion - for people who use shared terminology in project, programme and portfolio management. In practice, it tells users how these cost terms are to be understood across projects, programmes, control accounts, work packages and activities.

What does ISO 21506:2024/Amd.1:2026 specify?

ISO 21506:2024/Amd.1:2026 updates ISO 21506:2024 by replacing two vocabulary entries in clause 3. The amendment is focused on terminology, so it is used when an organization wants its project cost language to match the revised ISO wording.

The document is organized as a short amendment with front matter, a foreword, and two clause 3 changes:

• 3.7, budget at completion
• 3.25, estimate at completion

For readers, that means this amendment is not a separate method or process document. It is a controlled wording update to the existing vocabulary standard.

What are the key requirements of ISO 21506:2024/Amd.1:2026?

The key content of ISO 21506:2024/Amd.1:2026 is the replacement of two definitions in the vocabulary list. Both changes broaden the cost term so it can apply not only at project level, but also at programme, control account, work package and activity level.

Clause 3.7 - budget at completion

ISO 21506:2024/Amd.1:2026 replaces the definition of budget at completion with wording that treats it as the approved total cost to accomplish the work. The definition applies across several management levels, not just a project.

In practice, this matters when teams set baselines, compare planned and actual cost, or report performance. Using the revised term consistently helps avoid different departments using different meanings for the same cost target.

Clause 3.25 - estimate at completion

ISO 21506:2024/Amd.1:2026 replaces the definition of estimate at completion with wording that makes it the forecasted total cost to accomplish the work. As with budget at completion, the term is framed for a project, programme, control account, work package or activity.

In practice, this is the number people use for forward-looking cost control. It supports cost forecasting and reporting by giving one common term for the expected final cost.

Why the revised wording matters

The amendment aligns the two terms with multiple levels of project work. That helps organizations apply the same vocabulary in portfolio reporting, programme control, and detailed work-package tracking.

For a buyer or quality manager, the practical value is consistency: the revised wording can be adopted in procedures, templates, dashboards and training so cost reporting uses the same language across the organization.

What terms does ISO 21506:2024/Amd.1:2026 define?

• ISO - the International Organization for Standardization, which publishes the standard.
• IEC - the International Electrotechnical Commission, mentioned in the foreword as ISO’s close partner on electrotechnical standardization.
• budget at completion - the approved total cost to accomplish the work on a project, programme, control account, work package or activity.
• estimate at completion - the forecasted total cost to accomplish the work on a project, programme, control account, work package or activity.

Who uses ISO 21506:2024/Amd.1:2026?

ISO 21506:2024/Amd.1:2026 is used by people who write, review, or apply project management vocabulary. Typical users include project managers, programme managers, portfolio managers, PMO staff, cost controllers, planners, and quality managers.

It is relevant across industries that manage work as projects, programmes, or portfolios. The amendment is especially useful where organizations need a shared definition for cost terms in reporting, forecasting, and governance.

What changed in ISO 21506:2024/Amd.1:2026 from the previous edition?

ISO 21506:2024/Amd.1:2026 replaces the definitions of clause 3.7, budget at completion, and clause 3.25, estimate at completion. The new wording extends both terms to project, programme, control account, work package, and activity contexts.

Which standards are used with ISO 21506:2024/Amd.1:2026?

• ISO 21506:2024 - the base vocabulary standard that this amendment updates.
• ISO/IEC Directives, Part 1 - describes the procedures used to develop and maintain ISO documents.
• ISO/IEC Directives, Part 2 - gives the editorial rules used to draft the document.

What does the ISO 21506:2024/Amd.1:2026 document contain?

ISO 21506:2024/Amd.1:2026 contains the publication and copyright pages, the ISO foreword, and the amendment instructions for two vocabulary entries. The substantive part is limited to replacing the definitions for budget at completion and estimate at completion in clause 3.

It does not present methods, calculations, test procedures, or figures. Its role is to update terminology so organizations can align documents, systems, and reporting with the revised vocabulary.

International
Standard
ISO 21506
First edition
Project, programme and portfolio
2024-11
management — Vocabulary
AMENDMENT 1
AMENDMENT 1
2026-09
Management de projets, programmes et portefeuilles —
Vocabulaire
AMENDEMENT 1
Reference number
ISO 21506:2024/Amd.1:2026(en) © ISO 2026

ISO 21506:2024/Amd.1:2026(en)
© ISO 2026
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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 21506:2024/Amd.1:2026(en)
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
...

Norme
internationale
ISO 21506
Première édition
Management de projets,
2024-11
programmes et portefeuilles —
Vocabulaire
AMENDEMENT 1
2026-09
AMENDEMENT 1
Project, programme and portfolio management — Vocabulary
AMENDMENT 1
Numéro de référence
ISO 21506:2024/Amd.1:2026(fr) © ISO 2026

ISO 21506:2024/Amd.1:2026(fr)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2026
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: [phone]
E-mail: [e-mail]
Web: www.iso.org
Publié en Suisse
ii
ISO 21506:2024/Amd.1:2026(fr)
Avant-propos
L’ISO (Organisation internationale de normalisation) est une fédération mondiale d’organismes nationaux
de normalisation (comités membres de l’ISO). L’élaboration des Normes internationales est en général
confiée aux comités techniques de l’ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l’ISO participent également aux travaux. L’ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d’approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner l’utilisation
d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité et à l’applicabilité de
tout droit de brevet revendiqué à cet égard. À la da
...