NF ISO/IEC GUIDE 98-1
Guide to the expression of uncertainty in measurement - Part 1 : introduction
This document establishes general rules for evaluating and expressing uncertainty in measurement from the shop floor to fundamental research. Therefore, the principles of this suite of documents are intended to be applicable to a broad spectrum of measurements and their applications. An overview of the parts of the GUM is given in table A.1 in Annex A. NOTE Where the acronym GUM is used in this document, it refers to the suite of documents. An individual part of the GUM is referred to by its corresponding JCGM numbering (e.g., part 6 of the GUM is JCGM GUM-6:2020). This document gives a rationale for evaluating, expressing and using measurement uncertainty (Clause 2). A brief introduction is given to measurement (Clause 3) and to the decisions involved when evaluating measurement uncertainty (Clause 4). In Clause 5, a brief description of the contents of the parts of the GUM is given. In each of these clauses, the relevant parts of the GUM are identified for further guidance.
This document establishes general rules for evaluating and expressing uncertainty in measurement from the shop floor to fundamental research. Therefore, the principles of this suite of documents are intended to be applicable to a broad spectrum of measurements and their applications. An overview of the parts of the GUM is given in table A.1 in Annex A. NOTE Where the acronym GUM is used in this document, it refers to the suite of documents. An individual part of the GUM is referred to by its corresponding JCGM numbering (e.g., part 6 of the GUM is JCGM GUM-6:2020). This document gives a rationale for evaluating, expressing and using measurement uncertainty (Clause 2). A brief introduction is given to measurement (Clause 3) and to the decisions involved when evaluating measurement uncertainty (Clause 4). In Clause 5, a brief description of the contents of the parts of the GUM is given. In each of these clauses, the relevant parts of the GUM are identified for further guidance.
ISO/IEC Guide 98-1:2009 provides a brief introduction to the “Guide to the expression of uncertainty in measurement” (GUM) in order to indicate the relevance of that fundamental guide and promote its use. It also outlines documents related to the GUM that are intended to extend the application of that guide to broader categories and fields of practical problems. ISO/IEC Guide 98-1:2009 addresses measurement science at a level that is suitable for those readers who have received training at least to the second year of a science- or engineering-based degree course containing some teaching of probability theory and statistics. It also considers various concepts used in measurement science. In particular, it covers the need to characterize the quality of a measurement through appropriate statements of measurement uncertainty. This introductory document also outlines the recent evolution of thinking regarding measurement uncertainty.
ISO/IEC Guide 98-1:2009 provides a brief introduction to the “Guide to the expression of uncertainty in measurement” (GUM) in order to indicate the relevance of that fundamental guide and promote its use. It also outlines documents related to the GUM that are intended to extend the application of that guide to broader categories and fields of practical problems. ISO/IEC Guide 98-1:2009 addresses measurement science at a level that is suitable for those readers who have received training at least to the second year of a science- or engineering-based degree course containing some teaching of probability theory and statistics. It also considers various concepts used in measurement science. In particular, it covers the need to characterize the quality of a measurement through appropriate statements of measurement uncertainty. This introductory document also outlines the recent evolution of thinking regarding measurement uncertainty.
-
1 Domaine d'application
-
2 Justifications
-
3 Mesurage
-
4 Lignes directrices pour l'évaluation de l'incertitude de mesure
-
5 Parties du GUM
- Annex A Aperçu des parties du GUM
- Annexe ZZ Correspondance entre les guides ISO/IEC et les documents élaborés sous la conduite du JCGM pour lesquels des équivalents ne sont pas donnés dans le texte
- Bibliographie
The Requirements department helps you quickly locate within the normative text:
- mandatory clauses to satisfy,
- non-essential but useful clauses to know, such as permissions and recommendations.
The identification of these types of clauses is based on the document “ISO / IEC Directives, Part 2 - Principles and rules of structure and drafting of ISO documents ”as well as on a constantly enriched list of verbal forms.
With Requirements, quickly access the main part of the normative text!

At a glance, you will be able to identify the additions, deletions or modifications to a text, table, figure and formula.

The Redlines + service is offered to you on the collection of French standards in force, in French language and in HTML and PDF format.
For an overview of the service, click on View a standard in redline format
COBAZ is the simple and effective solution to meet the normative needs related to your activity, in France and abroad.
Available by subscription, CObaz is THE modular solution to compose according to your needs today and tomorrow. Quickly discover CObaz!
Request your free, no-obligation live demo
I discover COBAZ