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ISO 28592:2017

(Main)

Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)

Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)

ISO 28592:2017 provides double sampling plans by attributes for the acceptance inspection of lots of discrete items. The plans are indexed by the producer's risk quality (PRQ) and the consumer's risk quality (CRQ) where the nominal producer's and consumer's risks are respectively either (5 %, 5 %), (5 %, 10 %) or (10 %, 10 %). Plans are provided for inspection for percent nonconforming and for inspection for nonconformities per 100 items. The lot is accepted if there are no nonconforming items (nonconformities) in the first random sample, and rejected if it contains two or more nonconforming items (nonconformities). If precisely one nonconforming item is found in the first sample, a second random sample is drawn; the lot is then accepted if the second sample contains no nonconforming items (nonconformities) and rejected otherwise. The objective of this International Standard is to provide procedures that enable lot disposition to be determined quickly and economically if quality is particularly good or bad. For intermediate quality, a second sample is drawn in order to be able to discriminate more reliably between acceptable and unacceptable lots. The two sample sizes are chosen to minimize the maximum expected sample size with respect to incoming quality subject to the nominal risks not being exceeded. Similarly, the plans may be used to test the hypothesis that a lot or process quality level is equal to the PRQ (i.e. acceptable) against the alternative hypothesis that the quality level is equal to the CRQ (i.e. unacceptable). The plans are preferable to single sampling plans where the cost of inspection is high, where the delay and uncertainty caused by the possible requirement for second samples is inconsequential and where a relatively large ratio of the consumer's risk quality to the producer's risk quality can be tolerated. The plans are suitable for isolated lots or for short series of lots, where the sum of the two sample sizes is no larger than about 10 % of the size of the lot. The plans are also suitable for continuing series of lots when lots that fail to satisfy the acceptance criteria are 100 % inspected and all nonconforming items replaced by conforming items; however, for continuing series of lots, consideration should also be given to using double sampling plans from ISO 2859‑1. The statistical theory underlying the plans, tables and figures is provided in Annex A.

Plans d'échantillonnage double par attributs, avec taille d'échantillon minimale, indexés par la qualité du risque du fournisseur (QRF) et la qualité du risque du client (QRC)

Dvojni načrti vzorčenja za opisne spremenljivke z najmanjšimi velikostmi vzorcev, razvrščeni po stopnji kakovosti, ki ustreza določenemu tveganju proizvajalca in odjemalca

Ta mednarodni standard zagotavlja dvojne načrte vzorčenja za opisne spremenljivke za pregled sprejemljivosti serij diskretnih elementov. Načrti so razvrščeni po stopnji kakovosti, ki ustreza določenemu tveganju proizvajalca in odjemalca, pri čemer tveganja nominalnega proizvajalca in odjemalca znašajo (5 %, 5 %), (5 %, 10 %) ali (10 %, 10 %). Načrti se zagotovijo za inšpekcijski pregled za popolno neskladnost in za inšpekcijski pregled za neskladnosti na 100 elementov. Serija je sprejeta, če ni neskladnih elementov (neskladnosti) v prvem naključnem vzorcu, in zavrnjena, če vsebuje dva ali več neskladnih elementov (neskladnosti). Če se v prvem vzorcu odkrije natanko en neskladen element, se izbere drug naključen vzorec; serija je sprejeta, če drugi vzorec ne vsebuje neskladnih elementov (neskladnosti), sicer pa je zavrnjena.
Cilj tega mednarodnega standarda je določiti postopke, ki omogočajo hitro in ekonomično določitev odstranitve serije, če je kakovost zlasti dobra ali slaba. Za vmesno kakovost se izbere drug vzorec, da se omogoči zanesljivejše razlikovanje med sprejemljivimi in nesprejemljivimi serijami. Dve velikosti vzorcev se izbereta, da se zmanjša največja pričakovana velikost vzorca
ob upoštevanju vhodne kakovosti, ki je predmet nominalnega tveganja, ki se ne preseže.
Podobno se lahko načrti uporabijo za preskušanje hipoteze, da je stopnja kakovosti serije ali procesa enaka PRQ (tj. sprejemljiva), v primerjavi z alternativno hipotezo, da je stopnja kakovosti enaka CRQ (tj. nesprejemljiva).
Načrti imajo prednost pred enojnimi vzorčnimi načrti, kadar je strošek inšpekcijskega pregleda visok, kadar sta zamuda in negotovost, ki ju povzroči morebitna zahteva po jemanju drugega vzorca, nepomembni, ter kadar je možno dopustiti razmeroma velik delež stopnje kakovosti, ki ustreza določenemu tveganju odjemalca, glede na stopnjo kakovosti, ki ustreza določenemu tveganju proizvajalca. Načrti so primerni za izolirane serije ali za kratke sklope serij, kadar vsota dveh velikosti vzorcev ni večja od približno 10 % velikosti serije. Načrti so primerni tudi za trajne sklope serij, kadar so serije, ki ne izpolnjujejo meril sprejemljivosti, 100-odstotno pregledane, vsi neskladni elementi pa so nadomeščeni s skladnimi elementi; vendar bi bilo treba pri trajnih sklopih serij razmisliti tudi o uporabi dvojnih vzorčnih načrtov iz standarda ISO 2859-1.
Statistična teorija, na kateri temeljijo načrti, preglednice in vrednosti, je opisana v dodatku A.

General Information

Status
Published
Publication Date
22-Oct-2017
ICS
03.120.30 - Application of statistical methods
Technical Committee
ISO/TC 69/SC 5 - Acceptance sampling
Drafting Committee
ISO/TC 69/SC 5 - Acceptance sampling
Current Stage
9093 - International Standard confirmed
Completion Date
13-Jun-2024
Ref Project
SIST ISO 28592:2018 - Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)

Relations

Revises
ISO 28801:2011 - Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)
Effective Date
05-Nov-2015

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ISO 28592:2017 - Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ) Released:23. 10. 2017ISO 28592:2017 - Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ) Released:23. 10. 2017
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ISO 28592:2017 - Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)ISO 28592:2017 - Double sampling plans by attributes with minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)
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Standards Content (Sample)

SLOVENSKI STANDARD
SIST ISO 28592:2018
01-julij-2018
1DGRPHãþD
SIST ISO 28801:2014
'YRMQLQDþUWLY]RUþHQMD]DRSLVQHVSUHPHQOMLYNH]QDMPDQMãLPLYHOLNRVWPLY]RUFHY
UD]YUãþHQLSRVWRSQMLNDNRYRVWLNLXVWUH]DGRORþHQHPXWYHJDQMXSURL]YDMDOFDLQ
RGMHPDOFD
Double sampling plans by attributes with minimal sample sizes, indexed by producer's
risk quality (PRQ) and consumer's risk quality (CRQ)
Plans d'échantillonnage double par attributs, avec taille d'échantillon minimale, indexés
par la qualité du risque du fournisseur (QRF) et la qualité du risque du client (QRC)
Ta slovenski standard je istoveten z: ISO 28592:2017
ICS:
03.120.30 8SRUDEDVWDWLVWLþQLKPHWRG Application of statistical
methods
SIST ISO 28592:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST ISO 28592:2018

---------------------- Page: 2 ----------------------

SIST ISO 28592:2018
INTERNATIONAL ISO
STANDARD 28592
First edition
2017-10
Double sampling plans by attributes
with minimal sample sizes, indexed
by producer's risk quality (PRQ) and
consumer's risk quality (CRQ)
Plans d'échantillonnage double par attributs, avec taille d'échantillon
minimale, indexés par la qualité du risque du fournisseur (QRF) et la
qualité du risque du client (QRC)
Reference number
ISO 28592:2017(E)
©
ISO 2017

---------------------- Page: 3 ----------------------

SIST ISO 28592:2018
ISO 28592:2017(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. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

---------------------- Page: 4 ----------------------

SIST ISO 28592:2018
ISO 28592:2017(E)

Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, abbreviations and symbols . 1
3.1 Terms, definitions and abbreviations . 1
3.2 Symbols . 3
4 Choosing and operating a sampling plan . 3
4.1 Choosing a plan. 3
4.2 Operating a plan for nonconforming items . 4
4.2.1 Acceptance sampling . 4
4.2.2 Hypothesis testing . 4
4.3 Operating a plan for nonconformities . 4
4.3.1 Acceptance sampling .
...

INTERNATIONAL ISO
STANDARD 28592
First edition
2017-10
Double sampling plans by attributes
with minimal sample sizes, indexed
by producer's risk quality (PRQ) and
consumer's risk quality (CRQ)
Plans d'échantillonnage double par attributs, avec taille d'échantillon
minimale, indexés par la qualité du risque du fournisseur (QRF) et la
qualité du risque du client (QRC)
Reference number
ISO 28592:2017(E)
©
ISO 2017

---------------------- Page: 1 ----------------------
ISO 28592:2017(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. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 28592:2017(E)

Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, abbreviations and symbols . 1
3.1 Terms, definitions and abbreviations . 1
3.2 Symbols . 3
4 Choosing and operating a sampling plan . 3
4.1 Choosing a plan. 3
4.2 Operating a plan for nonconforming items . 4
4.2.1 Acceptance sampling . 4
4.2.2 Hypothesis testing . 4
4.3 Operating a plan for nonconformities . 4
4.3.1 Acceptance sampling . 4
4.3.2 Hypothesis testing . 4
4.4 Notation . 4
5 Operating characteristics . 5
6 Average sample sizes . 5
6.1 Curtailed inspection . 5
6
...

INTERNATIONAL ISO
STANDARD 28592
First edition
2017-10
Double sampling plans by attributes
with minimal sample sizes, indexed
by producer's risk quality (PRQ) and
consumer's risk quality (CRQ)
Plans d'échantillonnage double par attributs, avec taille d'échantillon
minimale, indexés par la qualité du risque du fournisseur (QRF) et la
qualité du risque du client (QRC)
Reference number
ISO 28592:2017(E)
©
ISO 2017

---------------------- Page: 1 ----------------------
ISO 28592:2017(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. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 28592:2017(E)

Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, abbreviations and symbols . 1
3.1 Terms, definitions and abbreviations . 1
3.2 Symbols . 3
4 Choosing and operating a sampling plan . 3
4.1 Choosing a plan. 3
4.2 Operating a plan for nonconforming items . 4
4.2.1 Acceptance sampling . 4
4.2.2 Hypothesis testing . 4
4.3 Operating a plan for nonconformities . 4
4.3.1 Acceptance sampling . 4
4.3.2 Hypothesis testing . 4
4.4 Notation . 4
5 Operating characteristics . 5
6 Average sample sizes . 5
6.1 Curtailed inspection . 5
6
...

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ISO
ISO 28594:2017(Main)
Combined accept-zero sampling systems and process control procedures for product acceptance

ISO 28594:2017 provides a set of accept‑zero sampling systems and procedures for planning and conducting inspections to assess quality and conformance to specified requirements. In addition, this International Standard provides requirements for alternative acceptance methods proposed by the supplier. Such alternative methods would be based upon establishing and implementing an internal prevention‑based quality management system as a means of ensuring that all products conform to requirements specified by the contract and associated specifications and standards. ISO 28594:2017, when cited in contract, is applicable to the supplier and extends to subcontractors or vendors. The quality plans are to be applied as specified in the contract documents, and deliverables may be submitted for acceptance if the requirements of this International Standard have been met. Sampling systems and procedures in this International Standard are applicable, when appropriate, to assess conformance to requirements of the following: a) end items; b) components or basic materials; c) operations or services; d) materials in process; e) supplies in storage; f) maintenance operations; g) data or records; h) administrative procedures. NOTE Use of the word "product" throughout this International Standard also refers to services and other deliverables. The sampling systems and procedures of this International Standard are not intended for use with destructive tests or where product screening is not feasible or desirable. In such cases, the sampling systems to be used will be specified in the contract or product specifications.

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ISO
ISO 28590:2017(Main)
Sampling procedures for inspection by attributes — Introduction to the ISO 2859 series of standards for sampling for inspection by attributes
SIST ISO 28590:2018

ISO 28590:2017 provides a general introduction to acceptance sampling by attributes and provides a brief summary of the attribute sampling schemes and plans used in ISO 2859‑1, ISO 2859‑2, ISO 2859‑3, ISO 2859‑4 and ISO 2859‑5, which describe specific types of attribute sampling systems. It also provides guidance on the selection of the appropriate inspection system for use in a particular situation.

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