ISO 5725-1-2023 PDF

Full title and description

Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions. This edition (ISO 5725-1:2023) provides the fundamental principles, definitions, organizational scheme and statistical model used across the ISO 5725 series to assess and report the trueness and precision of measurement methods that produce a single continuous numerical result.

Abstract

ISO 5725-1:2023 introduces the conditions, constraints and resources necessary to evaluate a measurement method or an individual measurement result. It defines an organisational scheme for acquiring data on trueness (bias) and precision (repeatability and reproducibility), provides essential definitions and a statistical model applicable to the whole ISO 5725 series, and sets the conceptual basis for subsequent parts that give calculation methods and experimental designs. The part is intended for methods yielding single continuous values and excludes topics covered by proficiency testing and reference material production standards.

General information

• Status: Published / Current
• Publication date: 20 July 2023
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 03.120.30 (Application of statistical methods); 17.020 (Metrology and measurement in general)
• Edition / version: Edition 2 (2023)
• Number of pages: 19

Scope

ISO 5725-1:2023 is concerned with measurement methods that provide results on a continuous scale and return a single numerical value (possibly the result of a calculation from observations). It defines the terminology, conceptual and statistical framework needed to describe and evaluate trueness and precision, and establishes the organizational approach for studies used to obtain data on bias and precision. The document applies across a wide range of test items (gases, liquids, powders, solids) provided heterogeneity is accounted for. It does not provide the specific computational procedures given in other parts of ISO 5725, and it is not intended to cover proficiency testing schemes or the production of reference materials (which are addressed by other standards).

Key topics and requirements

• Definitions of accuracy, trueness (bias) and precision (repeatability, reproducibility).
• Statistical model and notation used throughout the ISO 5725 series for bias and precision assessments.
• Organizational scheme for studies to acquire trueness and precision data (roles, study design considerations and required conditions).
• Conditions and constraints that affect measurement evaluation (item homogeneity, environmental control, operator and laboratory effects).
• Guidance on interpreting results and limits of applicability (continuous single-value measurement methods).
• Explicit exclusions and relationships to other standards (proficiency testing and reference material production excluded; calculation methods deferred to later parts of the series).

Typical use and users

ISO 5725-1:2023 is used by standards developers, testing and calibration laboratories, method developers, regulators, quality managers and statistical analysts. Typical applications include designing inter-laboratory studies, documenting method performance (bias, repeatability, reproducibility), supporting method validation and verification, and establishing the conceptual basis before applying the specific calculation procedures in subsequent parts of ISO 5725.

Related standards

ISO 5725-1 is part of the ISO 5725 series; related parts include ISO 5725-2 (basic methods for the determination of repeatability and reproducibility), ISO 5725-3, ISO 5725-4, ISO 5725-5 and ISO 5725-6 (which provide calculation procedures and guidance). Other related documents commonly cited with this part are ISO 13528 (statistical methods for proficiency testing), ISO Guide 35 (reference materials) and broader accreditation and testing standards such as ISO/IEC 17025.

Keywords

accuracy, trueness, precision, repeatability, reproducibility, bias, measurement methods, statistical model, method validation, inter-laboratory study, ISO 5725

FAQ

Q: What is this standard?

A: ISO 5725-1:2023 defines the general principles, terminology and statistical framework for assessing the accuracy (trueness and precision) of measurement methods that produce a single continuous numerical result.

Q: What does it cover?

A: It covers conceptual definitions, the statistical model and an organisational scheme for acquiring data on trueness and precision. It sets the foundation for the calculation methods provided in the other parts of the ISO 5725 series. It applies to continuous single-value measurement methods and excludes proficiency testing and reference material production topics.

Q: Who typically uses it?

A: Standards bodies, testing and calibration laboratories, method developers, regulators, quality managers and statisticians use this part as the conceptual basis for method evaluation, inter-laboratory studies and method validation activities.

Q: Is it current or superseded?

A: ISO 5725-1:2023 is the current edition (Edition 2, published in July 2023). It supersedes the earlier ISO 5725-1:1994 edition.

Q: Is it part of a series?

A: Yes. It is Part 1 of the ISO 5725 series. Subsequent parts of the series provide the specific experimental designs and calculation methods for estimating repeatability, reproducibility and bias.

Q: What are the key keywords?

A: Key keywords include accuracy, trueness, precision, repeatability, reproducibility, bias, measurement method, statistical model and inter-laboratory study.