ISO 25378:2011 PDF

Geometrical product specifications (GPS) — Characteristics and conditions — Definitions

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Title (English):

ISO 25378:2011

Geometrical product specifications (GPS) — Characteristics and conditions — Definitions

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 58
Publication date:: March 29, 2011
Edition:: ISO IS 25378 edition 1 version 1
ICS:: 17.040.01

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Description (English):

ISO 25378:2011 defines general terms for geometrical specifications, characteristics and conditions. These definitions are based on concepts developed in ISO 17450-1 and ISO 22432 and they are given by using a mathematical description based on Annex B of ISO 17450-1:2011. ISO 25378:2011 is not intended for industrial use as such among designers, but is aimed to serve as the "road map" mapping out the requirements based on geometrical features, thus enabling future standardization for industry and software makers in a consistent manner. ISO 25378:2011 defines general types of geometrical characteristics and conditions which can be used in GPS. These descriptions are applicable to a workpiece, an assembly, a population of workpieces, and a population of assemblies. These definitions are based on concepts of operators and the duality principle contained in ISO 17450-1 and ISO/TS 17450-2 and on the description of types of geometrical features defined in ISO 22432. Conceptually, these specification operators can be used as specification operators or as verification operators (duality principle). ISO 25378:2011 is not intended to define GPS specifications, symbology or other types of expression.

Technical details

Technical committee: ISO/TC 213 - Dimensional and geometrical product specifications and verification
SKU: ISO 25378:2011

Abstract

Overview

ISO 25378:2011 - Geometrical product specifications (GPS) - Characteristics and conditions - Definitions - provides a consistent, mathematically based vocabulary and conceptual framework for geometrical specifications, characteristics and conditions. It formalizes terms (for example, geometrical specification, condition, individual characteristic, population characteristic, local vs global) using concepts from ISO 17450‑1 and ISO 22432. ISO 25378 is intended as a roadmap for standards developers and software makers rather than as a prescriptive design or production standard.

Key Topics

Definitions and scope: precise meanings for GPS terms used across the ISO GPS matrix (workpiece, assembly, population of workpieces/assemblies).
Condition: a combination of a limit value and a binary relational mathematical operator (upper/lower limits, combined limits, or function-defined limits).
Characteristics:
- Individual characteristic - property measured on a single workpiece (subtypes: local individual and global individual).
- Population characteristic - statistical function derived from a population of individual values (used for SPC and process-level assessments).
Local vs Global: distinction between characteristics yielding multiple local values (e.g., two-point diameters along a cylinder) and those yielding a single unique value (e.g., minimum circumscribed cylinder diameter).
Operators and duality principle: specification operators can conceptually act as specification or verification operators; definitions align with the operator-based model in ISO 17450‑1 and ISO/TS 17450‑2.
Mathematical descriptions: terms are given using the formal mathematical approach referenced in Annex B of ISO 17450‑1.
Limitations: ISO 25378 does not define GPS symbology, specific tolerance values, or industrial design instructions - it standardizes terminology and conceptual mapping.

Applications / Who uses it

Standards developers: harmonize terminology across GPS standards and create consistent chains of standards.
Metrologists and measurement labs: adopt precise definitions for verification procedures and reporting.
Software vendors (CAD/CAM/inspection/SPC): implement consistent data models, operators and verification algorithms.
Quality engineers and manufacturing researchers: design statistical process control (SPC) strategies using population characteristics.
Academics and trainers: teach GPS concepts with standardized vocabulary.

Related Standards

ISO 17450‑1: General concepts - model for geometrical specification and verification
ISO/TS 17450‑2: Basic tenets, operators and uncertainties
ISO 22432: Features utilized in specification and verification
ISO 3534 series: Statistical vocabulary and symbols

By using ISO 25378 vocabulary and operator concepts, organizations ensure clearer communication of geometrical requirements, more consistent verification workflows, and improved interoperability for measurement and CAD/inspection software.

Related standards

Standards mentioned in the description

Abstract

Overview

Key Topics

Definitions and scope: precise meanings for GPS terms used across the ISO GPS matrix (workpiece, assembly, population of workpieces/assemblies).
Condition: a combination of a limit value and a binary relational mathematical operator (upper/lower limits, combined limits, or function-defined limits).
Characteristics:
- Individual characteristic - property measured on a single workpiece (subtypes: local individual and global individual).
- Population characteristic - statistical function derived from a population of individual values (used for SPC and process-level assessments).
Local vs Global: distinction between characteristics yielding multiple local values (e.g., two-point diameters along a cylinder) and those yielding a single unique value (e.g., minimum circumscribed cylinder diameter).
Operators and duality principle: specification operators can conceptually act as specification or verification operators; definitions align with the operator-based model in ISO 17450‑1 and ISO/TS 17450‑2.
Mathematical descriptions: terms are given using the formal mathematical approach referenced in Annex B of ISO 17450‑1.
Limitations: ISO 25378 does not define GPS symbology, specific tolerance values, or industrial design instructions - it standardizes terminology and conceptual mapping.

Applications / Who uses it

Standards developers: harmonize terminology across GPS standards and create consistent chains of standards.
Metrologists and measurement labs: adopt precise definitions for verification procedures and reporting.
Software vendors (CAD/CAM/inspection/SPC): implement consistent data models, operators and verification algorithms.
Quality engineers and manufacturing researchers: design statistical process control (SPC) strategies using population characteristics.
Academics and trainers: teach GPS concepts with standardized vocabulary.

Related Standards

ISO 17450‑1: General concepts - model for geometrical specification and verification
ISO/TS 17450‑2: Basic tenets, operators and uncertainties
ISO 22432: Features utilized in specification and verification
ISO 3534 series: Statistical vocabulary and symbols

ISO 25378:2011 PDF

Technical details

Abstract

Overview

Key Topics

Applications / Who uses it

Related Standards

Related standards

Abstract

Overview

Key Topics

Applications / Who uses it

Related Standards

Related standards

Geometrical product specifications (GPS) - General concepts - Part 1: Model for geometrical specification and…

Geometrical product specifications (GPS) - Features utilized in specification and verification (ISO 22432:201…

Geometrical product specifications (GPS) - Characteristics and conditions - Definitions (ISO 25378:2011)

Geometrical product specifications (GPS) — General concepts — Part 2: Basic tenets, specifications, operators…

Statistics. Vocabulary and symbols - Statistical quality control