SIST EN ISO 14253-1:2018

Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 1: Decision rules for proving conformity or nonconformity with specifications (ISO 14253-1:2017)

This document establishes the rules for verifying the conformity or nonconformity with a given
tolerance for a characteristic of a workpiece (or a population of workpieces) or with a given maximum
permissible errors for a metrological characteristic of a measuring equipment, including when the
measured value falls close to the specification limits, taking measurement uncertainty into account.
This document applies to specifications defined in general GPS standards (see ISO 14638), i.e. standards
prepared by ISO/TC 213, including:
— workpiece specifications and population specifications (usually given as an upper specification
limit or a lower specification limit or both);
— measuring equipment specifications (usually given as maximum permissible errors).
This document only applies for characteristics and maximum permissible errors expressed as
quantity values.

Geometrische Produktspezifikationen (GPS) - Prüfung von Werkstücken und Meßgeräten durch Messen - Teil 1: Entscheidungsregeln für den Nachweis von Konformität oder Nichtkonformität mit Spezifikationen (ISO 14253-1:2017)

Dieses Dokument legt Regeln für die Prüfung der Konformität oder Nichtkonformität mit einer vorgegebenen Toleranz für das Merkmal eines Werkstücks (oder eine Population von Werkstücken) oder mit den Grenzwerten für Messabweichungen für ein messtechnisches Merkmal eines Messmittels, auch wenn sich der Messwert unter Berücksichtigung der Messunsicherheit sehr nahe an einem der Grenzwerte der Spezifikation befindet.
Dieses Dokument gilt für Spezifikationen in allgemeinen GPS-Normen (siehe ISO 14638), die vom ISO/TC 213 erarbeitet wurden, einschließlich:
- Spezifikationen für Werkstücke und für die Population von Werkstücken (üblicherweise als eine obere Spezifikationsgrenze oder eine untere Spezifikationsgrenze oder beides angegeben);
- Spezifikationen für Messgeräte (üblicherweise als maximal zulässige Messabweichungen angegeben).
Dieses Dokument gilt nur für Merkmale und maximal zulässige Messabweichungen, die als Größenwerte angegeben werden.

Spécification géométrique des produits (GPS) - Vérification par la mesure des pièces et des équipements de mesure - Partie 1: Règles de décision pour prouver la conformité ou la non-conformité à la spécification (ISO 14253-1:2017)

L'ISO 14253-1 :2017 établit les règles permettant de contrôler la conformité ou la non-conformité à une tolérance donnée pour une caractéristique d'une pièce (ou d'une population de pièces) ou à des erreurs maximales tolérées données pour une caractéristique métrologique d'un équipement de mesure, y compris lorsque la valeur mesurée est proche des limites de spécification, en prenant en compte l'incertitude de mesure.
L'ISO 14253-1 :2017 s'applique aux spécifications définies dans les normes générales GPS (voir l'ISO 14638), c'est-à-dire les normes élaborées par l'ISO/TC 213, comprenant:
-      les spécifications de pièces et les spécifications de population (généralement exprimées sous forme de limite de spécification supérieure, ou de limite de spécification inférieure, ou les deux);
-      les spécifications des équipements de mesure (généralement exprimées sous forme d'erreurs maximales tolérées).
L'ISO 14253-1 :2017 s'applique uniquement aux caractéristiques et aux erreurs maximales tolérées exprimées sous forme de valeurs de grandeurs.

Specifikacija geometrijskih veličin izdelka (GPS) - Preverjanje z merjenjem obdelovancev in z merilno opremo - 1. del: Pravila odločanja za potrjevanje skladnosti ali neskladnosti s specifikacijo (ISO 14253-1:2017)

Ta dokument določa pravila za preverjanje skladnosti ali neskladnosti s podano toleranco za značilnost obdelovanca (ali skupine obdelovancev) ali podanimi največjimi dovoljenimi napakami za meroslovne značilnosti opreme za merjenje, vključno s primeri, ko je izmerjena vrednost blizu omejitev iz specifikacije, pri čemer se upošteva merilna negotovost.
Ta dokument se uporablja za specifikacije, opredeljene v splošnih standardih o specifikaciji geometrijskih veličin proizvoda (glej ISO 14638), tj. standardih, ki jih pripravlja ISO/TC 213, vključno s:
– specifikacijami obdelovanca in populacije (običajno podanimi kot zgornja meja, spodnja meja ali oboje),
– specifikacijami merilne opreme (običajno podanimi kot največje dovoljene napake).
Ta dokument se uporablja za lastnosti in največje dovoljene napake, ki so izražene kot količine/vrednosti.

General Information

• Status: Published
• Public Enquiry End Date: 09-Aug-2016
• Publication Date: 03-Jan-2018
• ICS: 17.040.30 - Measuring instruments
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 19-Dec-2017
• Due Date: 23-Feb-2018
• Completion Date: 04-Jan-2018
• Ref Project: EN ISO 14253-1:2017 - Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 1: Decision rules for verifying conformity or nonconformity with specifications (ISO 14253-1:2017)

Relations

• Revised: SIST EN ISO 14253-1:2014 - Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 1: Decision rules for proving conformity or nonconformity with specification (ISO 14253-1:2013)
• Effective Date: 01-Jul-2016
• Replaces: SIST EN ISO 14253-1:2014 - Geometrical product specifications (GPS) - Inspection by measurement of workpieces and measuring equipment - Part 1: Decision rules for proving conformity or nonconformity with specification (ISO 14253-1:2013)
• Effective Date: 13-Dec-2017

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 14253-1:2018
01-februar-2018
1DGRPHãþD
SIST EN ISO 14253-1:2014
6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND*363UHYHUMDQMH]PHUMHQMHP
REGHORYDQFHYLQ]PHULOQRRSUHPRGHO3UDYLODRGORþDQMD]DSRWUMHYDQMH
VNODGQRVWLDOLQHVNODGQRVWLVVSHFLILNDFLMR,62
Geometrical product specifications (GPS) - Inspection by measurement of workpieces
and measuring equipment - Part 1: Decision rules for proving conformity or
nonconformity with specifications (ISO 14253-1:2017)
Geometrische Produktspezifikationen (GPS) - Prüfung von Werkstücken und
Meßgeräten durch Messen - Teil 1: Entscheidungsregeln für den Nachweis von
Konformität oder Nichtkonformität mit Spezifikationen (ISO 14253-1:2017)
Spécification géométrique des produits (GPS) - Vérification par la mesure des pièces et
des équipements de mesure - Partie 1: Règles de décision pour prouver la conformité ou
la non-conformité à la spécification (ISO 14253-1:2017)
Ta slovenski standard je istoveten z: EN ISO 14253-1:2017
ICS:
17.040.30 Merila Measuring instruments
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND*36 Specification (GPS)
SIST EN ISO 14253-1:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 14253-1:2018

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SIST EN ISO 14253-1:2018


EN ISO 14253-1
EUROPEAN STANDARD

NORME EUROPÉENNE

December 2017
EUROPÄISCHE NORM
ICS 17.040.40 Supersedes EN ISO 14253-1:2013
English Version

Geometrical product specifications (GPS) - Inspection by
measurement of workpieces and measuring equipment -
Part 1: Decision rules for verifying conformity or
nonconformity with specifications (ISO 14253-1:2017)
Spécification géométrique des produits (GPS) - Geometrische Produktspezifikationen (GPS) - Prüfung
Vérification par la mesure des pièces et des von Werkstücken und Messgeräten durch Messen - Teil
équipements de mesure - Partie 1: Règles de décision 1: Entscheidungsregeln für den Nachweis von
pour contrôler la conformité ou la non-conformité à la Konformität oder Nichtkonformität mit Spezifikationen
spécification (ISO 14253-1:2017) (ISO 14253-1:2017)
This European Standard was approved by CEN on 28 September 2017.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14253-1:2017 E
worldwide for CEN national Members.

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SIST EN ISO 14253-1:2018
EN ISO 14253-1:2017 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 14253-1:2018
EN ISO 14253-1:2017 (E)
European foreword
This document (EN ISO 14253-1:2017) has been prepared by Technical Committee ISO/TC 213
"Dimensional and geometrical product specifications and verification" in collaboration with Technical
Committee CEN/TC 290 “Dimensional and geometrical product specification and verification” the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2018 and conflicting national standards shall be
withdrawn at the latest by June 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 14253-1:2013.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 14253-1:2017 has been approved by CEN as EN ISO 14253-1:2017 without any
modification.

3

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SIST EN ISO 14253-1:2018

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SIST EN ISO 14253-1:2018
INTERNATIONAL ISO
STANDARD 14253-1
Third edition
2017-10
Geometrical product specifications
(GPS) — Inspection by measurement
of workpieces and measuring
equipment —
Part 1:
Decision rules for verifying conformity
or nonconformity with specifications
Spécification géométrique des produits (GPS) — Vérification par la
mesure des pièces et des équipements de mesure —
Partie 1: Règles de décision pour contrôler la conformité ou la non-
conformité à la spécification
Reference number
ISO 14253-1:2017(E)
©
ISO 2017

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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2017 – All rights reserved

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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Default decision rules . 7
4.1 General . 7
4.2 Default conformance probability limit .11
4.3 Default nonconformance probability limit .11
5 Verifying conformity and nonconformity with specifications .11
5.1 General .11
5.2 Rule for verifying conformity with specifications .12
5.2.1 General.12
5.2.2 Case of normal PDF and default conformance probability limit .12
5.3 Rule for verifying nonconformity with specifications .14
5.3.1 General.14
5.3.2 Case of normal PDF and default nonconformance probability limit.14
5.4 Uncertainty zone .15
6 Application in a supplier/customer relationship .16
6.1 General .16
6.2 Supplier verifying conformity .16
6.3 Customer verifying nonconformity .17
Annex A (informative) Relation between the third edition and the second edition .18
Annex B (informative) Relation to the GPS matrix model .21
Bibliography .23
© ISO 2017 – All rights reserved iii

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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

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 documents 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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product
specifications and verification, in collaboration with Technical Committee CEN/TC 290, Dimensional and
geometrical product specification and verification.
This third edition cancels and replaces the second edition (ISO 14253-1:2013), which has been
technically revised with the following changes:
— The content applies ISO/IEC Guide 98-4 and gives recommendation for simplification by using
intervals representing the underlying probability. As a consequence, the default coverage factor
k = 2 has been replaced with a default conformance probability of 95 %. This makes the risk constant,
regardless of the relationship between the specification interval and the measurement uncertainty.
See Annex A for additional information.
— Some terminology has been updated.
— The explanation for the population specification modifier has been removed and can now be found
in ISO 18391.
A list of all parts in the ISO 14253 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved

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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

Introduction
This document is a geometrical product specifications (GPS) standard and is to be regarded as a general
GPS standard (see ISO 14638). It influences the chain link D of all chains of general GPS standards.
The ISO/GPS Matrix model given in ISO 14638 gives an overview of the ISO/GPS system of which this
document is a part. The fundamental rules of ISO/GPS given in ISO 8015 apply to this document and the
default decision rules given in this document apply in ISO/GPS, unless otherwise indicated.
For more detailed information on the relation of this document to other standards and the GPS matrix
model, see Annex B for additional information.
The estimated measurement uncertainty is to be taken into account when verifying conformity or
nonconformity with specification.
The problem arises when a measured value falls close to the upper or lower specification limit. In this
case, verification of conformity or nonconformity with specifications is not possible: the measurement
uncertainty induces a probability that a true value of the characteristic is out of specification even if the
measured value falls inside the specification zone, or is in specification even if the measured value falls
outside.
Therefore, suppliers and customers should agree in advance in a method to resolve any issues that may
arise. This document explains how to define default acceptance and rejection zones (i.e. decision rules)
for verifying conformity or nonconformity with specifications.
It is not the intention of this document to consider any prior knowledge of the possible values of the
measurand(s), e.g. the variability of the measured objects, which may influence the probability of
making the correct decision on verification [in mathematical terms, an a priori unconstrained maximum
entropy distribution (12) is assumed].
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SIST EN ISO 14253-1:2018
INTERNATIONAL STANDARD ISO 14253-1:2017(E)
Geometrical product specifications (GPS) — Inspection by
measurement of workpieces and measuring equipment —
Part 1:
Decision rules for verifying conformity or nonconformity
with specifications
1 Scope
This document establishes the rules for verifying the conformity or nonconformity with a given
tolerance for a characteristic of a workpiece (or a population of workpieces) or with a given maximum
permissible errors for a metrological characteristic of a measuring equipment, including when the
measured value falls close to the specification limits, taking measurement uncertainty into account.
This document applies to specifications defined in general GPS standards (see ISO 14638), i.e. standards
prepared by ISO/TC 213, including:
— workpiece specifications and population specifications (usually given as an upper specification
limit or a lower specification limit or both);
— measuring equipment specifications (usually given as maximum permissible errors).
This document only applies for characteristics and maximum permissible errors expressed as
quantity values.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3534-2, Statistics — Vocabulary and symbols — Part 2: Applied statistics
ISO 9000, Quality management systems — Fundamentals and vocabulary
ISO/IEC Guide 98-3, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM:1995)
ISO/IEC Guide 98-4, Uncertainty of measurement — Part 4: Role of measurement uncertainty in conformity
assessment
ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated
terms (VIM)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3534-2, ISO 9000,
ISO/IEC Guide 98-3, ISO/IEC Guide 98-4 and ISO/IEC Guide 99 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
© ISO 2017 – All rights reserved 1

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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

— IEC Electropedia: available at http://www.electropedia.org/
NOTE 1 “Probability density function (PDF)” is defined in ISO 3534-1.
NOTE 2 “Specification limit”, “upper specification limit (USL)”, “lower specification limit (LSL)”, “specified
tolerance” and “population” are defined in ISO 3534-2.
NOTE 3 “Maximum permissible measurement error”, “measurement uncertainty”, “standard measurement
uncertainty”, “combined standard measurement uncertainty”, “coverage interval” and “coverage probability” are
defined in ISO/IEC Guide 99.
NOTE 4 “Acceptance limit”, “acceptance interval”, “rejection interval”, “conformance probability” and “guard
band” are defined in ISO/IEC Guide 98-4.
NOTE 5 “Conformity” and “nonconformity” are defined in ISO 9000.
NOTE 6 For the purposes of this document, “characteristic” is used to express either a workpiece
characteristic, a workpiece population characteristic, or a metrological characteristic of measuring equipment.
Because conformity assessment involves measurement, these characteristics are also referred to as measurands.
3.1
specification zone
interval of values, of the workpiece characteristic or population characteristic or the maximum
permissible error (MPE) of a metrological characteristic of a measuring equipment, fulfilling the
specification
Note 1 to entry: A specification refers to or includes drawings, patterns or other relevant documents.
3.2
conformance probability limit
agreed minimum value of conformance probability when verifying conformity
Note 1 to entry: The conformance probability limit effectively sets the criterion for acceptance when verifying
conformity.
Note 2 to entry: A conformance probability limit of p corresponds to a risk of false acceptance less than or equal
to (1 − p).
3.3
default conformance probability limit
conformance probability limit (3.2) set by this document as default
3.4
lower nonconformance probability
probability that a value of a characteristic is below the lower specification limit
Note 1 to entry: A lower nonconformance probability exists only if a lower specification limit exists.
Note 2 to entry: Conformance probability, lower nonconformance probability and upper nonconformance
probability sum up to unity.
3.5
upper nonconformance probability
probability that a value of a characteristic is above the upper specification limit
Note 1 to entry: An upper nonconformance probability exists only if an upper specification limit exists.
Note 2 to entry: Conformance probability, lower nonconformance probability and upper nonconformance
probability sum up to unity.
2 © ISO 2017 – All rights reserved

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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

3.6
nonconformance probability limit
agreed minimum value of either the upper nonconformance probability (3.5) or the lower nonconformance
probability (3.4) when verifying nonconformity
Note 1 to entry: The nonconformance probability limit effectively sets the criterion for rejection when verifying
nonconformity.
Note 2 to entry: A nonconformance probability limit of p implies a risk of false rejection not exceeding (1 − p).
3.7
default nonconformance probability limit
nonconformance probability limit (3.6) set by this document as default
3.8
acceptance zone
set of one or more acceptance intervals
3.9
default acceptance zone
acceptance zone (3.8) based on the default conformance probability limit (3.3)
Note 1 to entry: See Figure 1.
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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

a) Specification defined only by a lower b) Specification defined only by an upper
specification limit specification limit
c) Specification defined by a lower and an upper specification limit
Key
1 specification zone
2 acceptance limits
3 acceptance zone
4 rejection zone
5 guard band g at lower specification limit
LA
6 guard band g at upper specification limit
UA
Y value of characteristic
LSL lower specification limit
USL upper specification limit
NOTE In most cases, the probability density function (PDF) associated with the measured value of the
characteristic is considered to be symmetrical, so that g , g have the same width.
UA LA
Figure 1 — Acceptance zone and rejection zone when verifying conformity
3.10
rejection zone
set of one or more rejection intervals
Note 1 to entry: The rejection zone is the complement to the acceptance zone (3.8).
3.11
default rejection zone
rejection zone (3.10) based on the default nonconformance probability limit (3.7).
Note 1 to entry: See Figure 2.
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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

a) Specification defined only by a lower b) Specification defined only by an upper
specification limit specification limit
c) Specification defined by a lower and an upper specification limit
Key
1 specification zone
2 acceptance limits
3 acceptance zone
4 rejection zone
7 guard band g at lower specification limit
LR
8 guard band g at upper specification limit
UR
Y value of characteristic
LSL lower specification limit
USL upper specification limit
NOTE In most cases, the probability density function (PDF) associated with the measured value of the
characteristic is considered to be symmetrical, so that g , g have the same width.
UR LR
Figure 2 — Rejection zone and acceptance zone when verifying nonconformity
3.12
uncertainty zone
set of interval(s) close to the specification limit(s) where neither conformity can be verified according
to the conformance probability limit (3.2) nor nonconformity can be verified according to the
nonconformance probability limit (3.6)
Note 1 to entry: The uncertainty zone is located about the specification limit (unilateral specification) or
specification limits (bilateral specification).
Note 2 to entry: The uncertainty zone on the upper and lower side of a specification limit may be of different
magnitudes.
Note 3 to entry: When verifying conformity, the uncertainty zone is part of the rejection zone (3.10) and not part
of the acceptance zone (3.8).
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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

Note 4 to entry: When verifying nonconformity, the uncertainty zone is part of the acceptance zone (3.8) and not
part of the rejection zone (3.10).
Note 5 to entry: See Figure 3, Figure 4, Figure 5 and Figure 6.
a) Specification defined only by a lower b) Specification defined only by an upper
specification limit specification limit
c) Specification defined by a lower and an upper specification limit
Key
1 specification zone
2A acceptance limits for verifying conformity
2R acceptance limits for verifying nonconformity
5 guard band g at lower specification limit for verifying conformity
LA
6 guard band g at upper specification limit for verifying conformity
UA
7 guard band g at lower specification limit for verifying nonconformity
LR
8 guard band g at upper specification limit for verifying nonconformity
UR
9 uncertainty zone
Y value of characteristic
LSL lower specification limit
USL upper specification limit
NOTE 1 Figure 3 c) could be seen as a combination of Figure 3 a) and Figure 3 b).
NOTE 2 In most cases, the probability density function (PDF) associated with the measured value of the
characteristic is considered to be symmetrical, so that g , g and g , g have the same width.
UA LA UR LR
Figure 3 — Uncertainty zone
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SIST EN ISO 14253-1:2018
ISO 14253-1:2017(E)

4 Default decision rules
4.1 General
A given specification (workpiece(s) characteristic with LSL and/or USL) is expressed on the drawing
and the respective chain of standards (see ISO 14638) or by the detailed description of the metrological
characteristic of the measurement equipment (e.g. in a standard) and the maximum permissible error
(MPE) of the indicated value.
Any measurement is affected by measurement uncertainty: the true value cannot be known exactly
and is expected to fall, with a predefined coverage probability, within a coverage interval.
NOTE 1 For guidance on how to estimate the measurement uncertainty, follow GUM or ISO 14253-2.
NOTE 2 The uncertainty of the estimate of a workpiece characteristic is different from the uncertainty of
the estimate of the population characteristic (e.g. the uncertainty of an individual value is different from the
uncertainty of an average value).
The central tendency and dispersion of values that can be reasonably attributed to the measurand are
often modelled with a probability density function (PDF).
Often, the PDF is assumed to be Gaussian (normally distributed). In this case, a coverage probability of
95 % corresponds to a coverage factor k = 1,96, typically approximated to k = 2. It is common practice to
assume symmetrical coverage intervals about the measured values; however, asymmetric intervals are
also possible, which are acceptable, as long as the coverage probability is met.
As measured values include uncertainty, any decision based on them is subject to a risk of being false. The
conformance probability is the probability that the true value falls inside the specification zone. Setting
a decision rule such that an item is accepted if the conformance probability is above a conformance
probability limit (e.g. 95 %) effectively confines the risk of false decision to the complement of such
conformance probability limit (e.g. 5 %).
Conformance probability should not be confused with coverage probability; see Clause 3.
Guard bands protect from incorrect decisions based on uncertain measured values close to the
specification limits.
The guard bands are fully determined by the PDF of the result of the measurement and the agreed
probability limit.
The acceptance zone for guarded acceptance is determined by reducing the specification zone of a
workpiece or population characteristic or the maximum permissible error of a measuring equipment
characteristic by the guard bands at each specification limit; see Figure 1. The figure also shows the rule
for unilateral characteristics. Conformity is verified if
...

SLOVENSKI STANDARD
oSIST prEN ISO 14253-1:2016
01-julij-2016
6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND*363UHYHUMDQMH]PHUMHQMHP
REGHORYDQFHYLQPHULOQHRSUHPHGHO3UDYLODRGORþDQMD]DSRWUMHYDQMH
VNODGQRVWLDOLQHVNODGQRVWLVVSHFLILNDFLMR,62',6
Geometrical product specifications (GPS) - Inspection by measurement of workpieces
and measuring equipment - Part 1: Decision rules for proving conformity or
nonconformity with specifications (ISO/DIS 14253-1:2016)
Geometrische Produktspezifikationen (GPS) - Prüfung von Werkstücken und
Meßgeräten durch Messen - Teil 1: Entscheidungsregeln für den Nachweis von
Konformität oder Nichtkonformität mit Spezifikationen (ISO/DIS 14253-1:2016)
Spécification géométrique des produits (GPS) - Vérification par la mesure des pièces et
des équipements de mesure - Partie 1: Règles de décision pour prouver la conformité ou
la non-conformité à la spécification (ISO/DIS 14253-1:2016)
Ta slovenski standard je istoveten z: prEN ISO 14253-1 rev
ICS:
17.040.30 Merila Measuring instruments
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND*36 Specification (GPS)
oSIST prEN ISO 14253-1:2016 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 14253-1:2016

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oSIST prEN ISO 14253-1:2016
DRAFT INTERNATIONAL STANDARD
ISO/DIS 14253-1
ISO/TC 213 Secretariat: DS
Voting begins on: Voting terminates on:
2016-06-06 2016-08-28
Geometrical product specifications (GPS) — Inspection by
measurement of workpieces and measuring equipment —
Part 1:
Decision rules for verifying conformity or nonconformity
with specifications
Spécification géométrique des produits (GPS) — Vérification par la mesure des pièces et des équipements
de mesure —
Partie 1: Règles de décision pour contrôler la conformité ou la non- conformité à la spécification
ICS: 17.040.01
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 14253-1:2016(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2016

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ISO/DIS 14253-1:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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CH-1214 Vernier, Geneva, Switzerland
Tel. [phone]
Fax [phone]
[e-mail]
www.iso.org
ii © ISO 2016 – All rights reserved

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Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Default decision rules . 6
4.1 General . 6
4.2 Default conformance probability limit .10
4.3 Default nonconformance probability limit .10
5 Verifying conformity and nonconformity with specifications .10
5.1 Rule for verifying conformity with specifications .10
5.2 Rule for verifying nonconformity with specifications .11
5.3 Uncertainty zone .13
6 Application in a supplier/customer relationship .13
6.1 General .13
6.2 Supplier verifying conformity .13
6.3 Customer verifying nonconformity .14
Annex A (informative) Relation between 3rd edition and 2nd edition .15
Annex B (informative) Relation to Hypothesis Testing .18
Annex C (informative) Relation to the GPS matrix model .20
Bibliography .22
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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 documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directives
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received. www.iso.org/patents
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 213, Dimensional and geometrical product
specifications and verification.
This third edition cancels the second edition (ISO 14253-1:2013). The content applies ISO/IEC Guide 98-
4:2012 and gives recommendation for simplification by using intervals representing the underlying
probability approaches. As a consequence the default coverage factor k = 2 has been replaced with a
default conformance probability of 95%. Some terminology has been updated.
ISO 14253 consists of the following parts, under the general title Geometrical product specifications
(GPS) — Inspection by measurement of workpieces and measuring equipment:
— Part 1: Decision rules for verifying conformity or nonconformity with specifications
— Part 2: Guidance for the estimation of uncertainty in GPS measurement, in calibration of measuring
equipment and in product verification
— Part 3: Guidelines for achieving agreements on measurement uncertainty statements
— Part 4: Background on functional limits and specification limits in decision rules [TS]
— Part 5: Uncertainty in verification testing of indicating measuring instruments
— Part 6: Generalized decision rules for the acceptance and rejection of instruments and workpieces [TR]
iv © ISO 2016 – All rights reserved

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Introduction
This part of ISO 14253 is a geometrical product specifications (GPS) standard and is to be regarded
as a global GPS standard (see ISO 14638). It influences the chain link D of all chains of general GPS
standards.
The ISO/GPS Matrix model given in ISO 14638 gives an overview of the ISO/GPS system of which this
document is a part. The fundamental rules of ISO/GPS given in ISO 8015 apply to this document and the
default decision rules given in this document apply in ISO/GPS, unless otherwise indicated.
For more detailed information on the relation of this part of ISO 14253 to other standards and the GPS
matrix model, see Annex C.
The estimated measurement uncertainty is to be taken into account when verifying conformity or
nonconformity with specification.
The problem arises when a measurement result falls close to the upper or lower specification limit.
In this case verification of conformity or nonconformity with specifications is not possible: the
measurement uncertainty induces a probability that a true value of the measurand is out of specification
even if the measured result falls inside the specification zone, or is in specification even if the measured
value falls outside.
Therefore, suppliers and customers should agree in advance a method to resolve any issues that may
arise. This part of ISO 14253 explains how to define default acceptance- and rejection zones (i.e. decision
rules) for verifying conformity or nonconformity with specifications.
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oSIST prEN ISO 14253-1:2016
DRAFT INTERNATIONAL STANDARD ISO/DIS 14253-1:2016(E)
Geometrical product specifications (GPS) — Inspection by
measurement of workpieces and measuring equipment —
Part 1:
Decision rules for verifying conformity or nonconformity
with specifications
1 Scope
This part of ISO 14253 establishes the rules for verifying the conformity or nonconformity with a given
tolerance for a characteristic of a workpiece (or a population of workpieces) or with given maximum
permissible errors for a metrological characteristic of a measuring equipment, including when the
measurement result falls close to the specification limits, taking measurement uncertainty into account.
This part of ISO 14253 applies to specifications defined in general GPS standards (see ISO 14638), i.e.
standards prepared by ISO/TC 213, including:
— workpiece/population of workpieces specifications (usually given as an upper specification limit or
a lower specification limit or both), and;
— measuring equipment specifications (usually given as maximum permissible errors).
This part of ISO 14253 only applies for characteristics and maximum permissible errors expressed as
quantity values.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 3534-1:2006, Statistics — Vocabulary and symbols — Part 1: General statistical terms and terms used
in probability
ISO 3534-2:2006, Statistics — Vocabulary and symbols — Part 2: Applied statistics
ISO 9000:2005, Quality management systems — Fundamentals and vocabulary
ISO/IEC Guide 98-3:2008, Uncertainty of measurement — Part 3: Guide to the expression of uncertainty in
measurement (GUM:1995)
ISO/IEC Guide 98-4:2012, Uncertainty of measurement — Part 4: Role of measurement uncertainty in
conformity assessment
ISO/IEC Guide 99, International vocabulary of metrology — Basic and general concepts and associated
terms (VIM)
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3534-2, ISO 9000,
ISO/IEC Guide 98-3, ISO/IEC Guide 98-4 and ISO/IEC Guide 99 and the following apply.
Note 1 to entry “Specification limit”, “upper specification limit (USL)“, “lower specification limit (LSL)“,
“specified tolerance” and “population” are defined in ISO 3534-2:2006.
Note 2 to entry “Maximum permissible measurement error”, “measurement uncertainty“, ”standard
measurement uncertainty”, “combined standard measurement uncertainty”, “coverage interval” and “coverage
probability” are defined in ISO/IEC Guide 99:2007.
Note 3 to entry “Acceptance limit“, “acceptance interval“, “rejection interval“, “conformance probability” and
“guard band“ are defined in ISO/IEC Guide 98-4:2012.
Note 4 to entry “Conformity” and “nonconformity” are defined in ISO 9000:2005.
3.1
specification zone
variate values of the specified workpiece characteristic or population characteristic or the specified
maximum permissible error (MPE) of a metrological characteristic of a measuring equipment fulfilling
the specification
Note 1 to entry: A specification refers to or includes drawings, patterns or other relevant documents.
3.2
conformance probability limit
agreed minimum value of conformance probability when verifying conformity
Note 1 to entry: The conformance probability limit effectively sets the criterion for acceptance when verifying
conformity.
Note 2 to entry: A conformance probability limit of p corresponds to a risk of false acceptance not exceeding
(1 - p).
3.3
default conformance probability limit
conformance probability limit (3.2) set by this international standard as default
3.4
nonconformance probability
probability that an item does not fulfil a specified requirement
Note 1 to entry: The conformance probability and nonconformance probability sum up to unity
3.5
nonconformance probability limit
agreed minimum value of nonconformance probability (3.4) when verifying nonconformity
Note 1 to entry: The nonconformance probability limit effectively sets the criterion for rejection when verifying
nonconformity.
Note 2 to entry: A nonconformance probability limit of p corresponds to a risk of false rejection not exceeding
(1 - p).
3.6
default nonconformance probability limit
nonconformance probability limit (3.5) set by this international standard as default
3.7
acceptance zone
set of one or more acceptance intervals.
2 © ISO 2016 – All rights reserved

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3.8
default acceptance zone
acceptance zone (3.7) based on the default conformance probability limit (3.3).
Note 1 to entry: See Figure 1 .
Key
A1, A2 specification with a single specification limit
B specification with lower and upper specification limits
1 specification zone
2 acceptance limits
3 acceptance zone
4 rejection zone
g , g upper and lower guard band
U L
Figure 1 — Acceptance zone and rejection zone when verifying conformity
3.9
rejection zone
set of one or more rejection intervals
Note 1 to entry: The rejection zone is the complement to the acceptance zone (3.7)
3.10
default rejection zone
rejection zone (3.9) based on the default nonconformance probability limit (3.5)
Note 1 to entry: See Figure 2
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Key
A1, A2 specification with a single specification limit
B specification with lower and upper specification limits
1 specification zone
2 acceptance limits
3 acceptance zone
4 rejection zone
g
, g upper and lower guard band
U L
Figure 2 — Rejection zone and acceptance zone when verifying nonconformity
4 © ISO 2016 – All rights reserved

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3.11
uncertainty zone
set of interval(s) close to the specification limit(s) where neither conformity can be verified according
to the conformance probability limit (3.2) nor nonconformity can be verified according to the
nonconformance probability limit (3.5).
Note 1 to entry: The uncertainty zone is located about the specification limit (one-sided specification) or
specification limits (two-sided specification).
Note 2 to entry: The uncertainty zone on the upper and lower side of a specification limit may be of different
magnitudes.
Note 3 to entry: When verifying conformity the uncertainty zone is part of the rejection zone.
Note 4 to entry: When verifying nonconformity the uncertainty zone is part of the acceptance zone (3.7).
Note 5 to entry: See Figure 3 , Figure 4 , Figure 5 and Figure 6 .
Key
A1, A2 specification with a single specification limit
B specification with lower and upper
1 specification zone
5 uncertainty zone
g , g upper and lower guard band
U L
NOTE Figure B could be seen as combination of A1 and A2
Figure 3 — Uncertainty zone
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4 Default decision rules
4.1 General
A given specification (LSL and/or USL) is defined by the drawing indication and the respective chain
of standards (see ISO 14638) or by the detailed description of the characteristic of the measurement
equipment (e.g. in a standard) and the indicated value of the maximum permissible error (MPE).
NOTE 1 The measurand for an individual characteristic (workpiece characteristic) is different from the
measurand for a population characteristic, implying different measurement uncertainties.
Any measurement is affected by measurement uncertainty: the true value cannot be known exactly,
and is expected to fall, with a predefined coverage probability, within a coverage interval.
Measurement uncertainty (the expanded measurement uncertainty) is determined by the uncertainty
components in the measuring process (see ISO 14253-2).
NOTE 2 The uncertainty of the estimate of a workpiece characteristic is different from the uncertainty of
the estimate of the population characteristic (e.g. the uncertainty of an individual value is different from the
uncertainty of an average value).
NOTE 3 The knowledge of the true value is often modelled with a probability density function (PDF).
NOTE 4 Often the PDF is assumed to be Gaussian (normally distributed). In this case a coverage probability of
95% corresponds to a coverage factor k =1,96, typically approximated to k =2.
NOTE 5 It is common practice to assume symmetrical coverage intervals about the measured values; however,
asymmetric intervals are
...