iTeh StandardsiTeh Standards
EURUSD
Your shopping cart is empty.
ISO

ISO 28593:2017

(Main)

Acceptance sampling procedures by attributes — Accept-zero sampling system based on credit principle for controlling outgoing quality

Acceptance sampling procedures by attributes — Accept-zero sampling system based on credit principle for controlling outgoing quality

ISO 28593:2017 specifies a system of single sampling schemes for lot-by-lot inspection by attributes. All the sampling plans of the present system are of accept-zero form, i.e. no lot is accepted if the sample from it contains one or more nonconforming items. The schemes depend on a suitably-defined average outgoing quality limit (AOQL), the value of which is chosen by the user; no restrictions are placed on the choice of the value of the AOQL or on the sizes of successive lots in the series. The methodology ensures that the overall average quality reaching the customer or market-place will not exceed the AOQL in the long run.

Procédures d'échantillonnage par attributs pour acceptation — Système d'échantillonnage de tolérance zéro-défaut basé sur le principe de crédit pour le contrôle de la qualité à la sortie

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

Relations

Revises
ISO 18414:2006 - Acceptance sampling procedures by attributes — Accept-zero sampling system based on credit principle for controlling outgoing quality
Effective Date
04-Nov-2015

Buy Standard

ISO 28593:2017 - Acceptance sampling procedures by attributes — Accept-zero sampling system based on credit principle for controlling outgoing quality Released:23. 10. 2017ISO 28593:2017 - Acceptance sampling procedures by attributes — Accept-zero sampling system based on credit principle for controlling outgoing quality Released:23. 10. 2017
PreviousNext
Standard
ISO 28593:2017 - Acceptance sampling procedures by attributes — Accept-zero sampling system based on credit principle for controlling outgoing quality Released:23. 10. 2017
English language
9 pages
sale 15% off
Preview
sale 15% off
Preview
ISO 28593:2017 - Acceptance sampling procedures by attributes -- Accept-zero sampling system based on credit principle for controlling outgoing qualityISO 28593:2017 - Acceptance sampling procedures by attributes -- Accept-zero sampling system based on credit principle for controlling outgoing quality
PreviousNext
Standard
ISO 28593:2017 - Acceptance sampling procedures by attributes -- Accept-zero sampling system based on credit principle for controlling outgoing quality
English language
9 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 28593
First edition
2017-10
Acceptance sampling procedures by
attributes — Accept-zero sampling
system based on credit principle for
controlling outgoing quality
Procédures d'échantillonnage par attributs pour acceptation —
Système d'échantillonnage de tolérance zéro-défaut basé sur le
principe de crédit pour le contrôle de la qualité à la sortie
Reference number
ISO 28593:2017(E)
©
ISO 2017

---------------------- Page: 1 ----------------------
ISO 28593:2017(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 28593:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 2
5 Average outgoing quality limit . 3
6 Credit principle . 3
7 Treatment of non-accepted lots . 4
8 Sampling plans . 4
9 Preliminary operations . 4
10 Standard procedure . 5
11 Procedure during continuing inspection . 6
12 Discontinuation of inspection . 6
Annex A (informative) Examples of sample sizes required for credit-based accept-zero plans .8
Bibliography . 9
© ISO 2017 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 28593:2017(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 Commi
...

INTERNATIONAL ISO
STANDARD 28593
First edition
2017-10
Acceptance sampling procedures by
attributes — Accept-zero sampling
system based on credit principle for
controlling outgoing quality
Procédures d'échantillonnage par attributs pour acceptation —
Système d'échantillonnage de tolérance zéro-défaut basé sur le
principe de crédit pour le contrôle de la qualité à la sortie
Reference number
ISO 28593:2017(E)
©
ISO 2017

---------------------- Page: 1 ----------------------
ISO 28593:2017(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 28593:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 2
5 Average outgoing quality limit . 3
6 Credit principle . 3
7 Treatment of non-accepted lots . 4
8 Sampling plans . 4
9 Preliminary operations . 4
10 Standard procedure . 5
11 Procedure during continuing inspection . 6
12 Discontinuation of inspection . 6
Annex A (informative) Examples of sample sizes required for credit-based accept-zero plans .8
Bibliography . 9
© ISO 2017 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 28593:2017(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 Commi
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.

This May Also Interest You

ISO
ISO 3951-6:2023(Main)
Sampling procedures for inspection by variables — Part 6: Specification for single sampling plans for isolated lot inspection indexed by limiting quality (LQ)

This document specifies an acceptance sampling system of single sampling plans for inspection by variables, primarily designed for use under the following conditions: a) where the inspection procedure is applied to an isolated lot of discrete products all supplied by one producer using one production process; b) where only a single quality characteristic, x, of this process is taken into consideration, which is measurable on a continuous scale; c) where the quality characteristic, x, is distributed according to a normal distribution or a close approximation to a normal distribution; d) where the quality characteristic can be measured without error or with moderate measurement error; e) where a contract or standard defines a lower specification limit, L, an upper specification limit, U, or both; an item is qualified as conforming if and only if its measured quality characteristic, x, satisfies the appropriate one of the following inequalities: 1) x ≥ L (i.e. the lower specification limit is not violated); 2) x ≤ U (i.e. the upper specification limit is not violated); 3) x ≥ L and x ≤ U (i.e. neither the lower nor the upper specification limit is violated). Inequalities 1) and 2) are cases with a single specification limit, whereas inequality 3) is a case with double specification limits. Where double specification limits apply, it is assumed in this document that conformance to both specification limits is equally important to the integrity of the product. In such cases, it is appropriate to apply a single LQ to the combined fraction of a product outside the two specification limits. This is referred to as combined control.

  • Standard
    80 pages
    English language
    sale 15% off
ISO
ISO 28596:2022(Main)
Sampling procedures for inspection by attributes — Two-stage sampling plans for auditing and for inspection under prior information

This document specifies two-stage (double) sampling plans by attributes for inspection for a proportion of nonconforming items in a target population of discrete units, in particular: a) the proportion of nonconforming items in a lot of product items; b) the proportion of nonconforming function instances of an internal control system (ICS); c) the proportion of misstatements in a population of accounting entries or booking records; d) the proportion of nonconforming test characteristics of an entity subject to an acceptance test, e.g. in product and process audits. The plans are preferable to single sampling plans where the cost of inspection is high or where the delay and uncertainty caused by the possible requirement for second samples is inconsequential. The statistical theory underlying the plans, tables and figures are provided in Annexes A through K.

  • Standard
    41 pages
    English language
    sale 15% off
ISO
ISO 3951-1:2022(Main)
Sampling procedures for inspection by variables — Part 1: Specification for single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic and a single AQL
SIST ISO 3951-1:2023

This document specifies single sampling plans for lot-by-lot inspection under the following conditions: a) where the inspection procedure is applied to a continuing series of lots of discrete products, all supplied by one producer using one production process; b) where only a single quality characteristic, x, of these products is taken into consideration, which is measurable on a continuous scale; c) where production is under statistical control and the quality characteristic, x, is distributed according to a normal distribution or a close approximation to the normal distribution; d) where a contract or standard defines a lower specification limit, L, an upper specification limit, U, or both. An item is qualified as conforming if its measured quality characteristic, x, satisfies as appropriate one of the following inequalities: 1) x ≥ L (i.e. the lower specification limit is not violated); 2) x ≤ U (i.e. the upper specification limit is not violated); 3) x ≥ L and x ≤ U (i.e. neither the lower nor the upper specification limit is violated). Inequalities 1) and 2) are cases with a single specification limit, and 3) is a case with double specification limits. Where double specification limits apply, it is assumed in this document that conformity to both specification limits is equally important to the integrity of the product. In such cases, it is appropriate to apply a single AQL to the combined percentage of a product outside the two specification limits. This is referred to as combined control.

  • Standard
    114 pages
    English language
    sale 10% off
    e-Library read for
    1 day
  • Standard
    107 pages
    English language
    sale 15% off
  • Standard
    110 pages
    French language
    sale 15% off
ISO
ISO 2859-4:2020(Main)
Sampling procedures for inspection by attributes — Part 4: Procedures for assessment of declared quality levels
SIST ISO 2859-4:2021

This document establishes single sampling plans for conformance testing, i.e., for assessing whether the quality level of a relevant audit population (lot, process, inventory, file etc) conforms to a declared value. Sampling plans are provided corresponding to four levels of discriminatory ability. The limiting quality ratio (LQR) (see Clause 4) of each sampling plan is given for reference. For levels I-III, the sampling plans have been devised so as to obtain a risk no more than 5 % of contradicting a correct declared quality level. The risk of failing to contradict an incorrectly declared quality level which is related to the LQR is no more than 10 %. The sample sizes for level 0 are designed in a way that the LQR factors of the sampling plans are compatible with the LQR factors for level I. In contrast to the procedures in the other parts of the ISO 2859 series, the procedures in this document are not applicable to acceptance assessment of lots. Generally, this document mainly focuses on controlling type I error, which differs from the balancing of the risks in the procedures for acceptance sampling. This document can be used for various forms of quality inspection in situations where objective evidence of conformity to some declared quality level is to be provided by means of inspection of a sample. The procedures are applicable to entities such as lots, process output, etc. that allow random samples of individual items to be taken from the entity. The sampling plans provided in this document are applicable, but not limited, to the inspection of a variety of targets such as: — end items; — components and raw materials; — operations; — materials in process; — supplies in storage; — maintenance operations; — data or records; — administrative procedures; — accounting procedures or accounting entries; — internal control procedures. This document considers two types of quality models for discrete items and populations, as follows. i) The conforming-nonconforming model, where each item is classified as conforming or nonconforming, and where the quality indicator of a population of items is the proportion p of nonconforming items, or, equivalently, the percentage 100 p of nonconforming items. ii) The nonconformities model, where the number of nonconformities is counted on each item, and where the quality indicator of a population of items is the average number λ of nonconformities found on items in the population, or, equivalently, the percentage 100 λ of nonconformities on items in the population.

  • Standard
    23 pages
    English language
    sale 10% off
    e-Library read for
    1 day
  • Standard
    18 pages
    English language
    sale 15% off
  • Standard
    19 pages
    French language
    sale 15% off
ISO
ISO 2859-2:2020(Main)
Sampling procedures for inspection by attributes — Part 2: Sampling plans indexed by limiting quality (LQ) for isolated lot inspection
SIST ISO 2859-2:2020

This document specifies an acceptance sampling system for inspection by attributes indexed by limiting quality (LQ). The sampling system is used for lots in isolation (isolated sequences of lots, an isolated lot, a unique lot or a short series of lots), where switching rules, such as those of ISO 2859‑1, are not applicable. Inspection levels, as provided by ISO 2859‑1 to control the relative amount of inspection, are not provided in this document. In many industrial situations, in which switching rules might be used, they are not applied for a number of reasons, not all of which might be valid: a) production is intermittent (not continuous); b) production is from several different sources in varying quantities, i.e. "job lots"; c) lots are isolated; d) lots are resubmitted after inspection. The sampling plans in this document are indexed by a series of specified values of limiting quality (LQ), where the consumer's risk (the probability of acceptance at the LQ) is usually below 0,10 (10 %), except in some instances. This document is intended both for inspection for nonconforming items and for inspection for nonconformities per 100 items. It is intended to be used when the supplier and the consumer both regard the lot to be in isolation. That is, the lot is unique in that it is the only one of its type produced. It can also be used when there is a series of lots too short for switching rules to be applied.

  • Standard
    50 pages
    English language
    sale 10% off
    e-Library read for
    1 day
  • Standard
    46 pages
    English language
    sale 15% off
  • Standard
    46 pages
    French language
    sale 15% off
ISO
ISO 39511:2018(Main)
Sequential sampling plans for inspection by variables for percent nonconforming (known standard deviation)
SIST ISO 39511:2018

This International Standard specifies sequential sampling plans and procedures for inspection by variables of discrete items. The plans are indexed in terms of producer's risk point and the consumer's risk point. Therefore, they are suitable not only for the purposes of acceptance sampling, but for the more general purpose of the testing of simple statistical hypotheses for proportions. The purpose of this International Standard is to provide procedures for the sequential assessment of inspection results that may be used to induce the supplier to supply lots of a quality having a high probability of acceptance. At the same time, the consumer is protected by a prescribed upper limit to the probability of accepting a lot (or process) of poor quality. This International Standard is primarily designed for use under the following conditions: a) where the inspection procedure is to be applied to a continuing series of lots of discrete products all supplied by one producer using one production process. In such a case, sampling of particular lots is equivalent to the sampling of the process. If there are different producers or production processes, this International Standard shall be applied to each one separately; b) where only a single quality characteristic x of these products is taken into consideration, which must be measurable on a continuous scale; c) where the measurement error is negligible (i.e. with a standard deviation no more than 10 % of the process standard deviation); d) where production is stable (under statistical control) and the quality characteristic x has a known standard deviation, and is distributed according to a normal distribution or a close approximation to the normal distribution; CAUTION — The procedures in this International Standard are not suitable for application to lots that have been screened previously for nonconforming items. e) where a contract or standard defines an upper specification limit U, a lower specification limit L, or both; an item is qualified as conforming if and only if its measured quality characteristic, x, satisfies the appropriate one of the following inequalities: x ≤ U (i.e. the upper specification limit is not violated); x ≥ L (i.e. the lower specification limit is not violated); and (i.e. neither the upper nor the lower specification limit is violated.) Inequalities 1) and 2) are called cases with a "single specification limit", and 3) is the case with "double specification limits". In this International Standard, it is assumed that, where double specification limits apply, conformance to both specification limits is either equally important to the integrity of the product or is considered separately for both specification limits. In the first case, it is appropriate to control the combined percentage of product outside the two specification limits. This is referred to as combined control. In the second case, nonconformity beyond each of the limits is controlled separately, and this is referred to as separate control.

  • Standard
    41 pages
    English language
    sale 10% off
    e-Library read for
    1 day
  • Standard
    35 pages
    English language
    sale 15% off
  • Standard
    35 pages
    French language
    sale 15% off
ISO
ISO 28597:2017(Main)
Acceptance sampling procedures by attributes — Specified quality levels in nonconforming items per million
SIST ISO 28597:2018

ISO 28597:2017 specifies, for quality levels expressed as nonconforming items per million items, procedures for estimating the quality level of a single entity (e.g. a lot) and, when the production process is in statistical control, for estimating the process quality level based on evidence from several samples. Procedures are also specified for using this information when selecting a suitable sampling plan so as to verify that the quality level of a given lot does not exceed a stated limiting quality level (LQL). For the case where no prior sample data is available, guidance is given for presuming a process quality level in selecting a plan.

  • Standard
    25 pages
    English language
    sale 10% off
    e-Library read for
    1 day
  • Standard
    19 pages
    English language
    sale 15% off
  • Standard
    19 pages
    English language
    sale 15% off
  • Standard
    19 pages
    French language
    sale 15% off
  • Standard
    19 pages
    French language
    sale 15% off
ISO
ISO 28591:2017(Main)
Sequential sampling plans for inspection by attributes
SIST ISO 28591:2018

ISO 28591:2017 specifies sequential sampling plans and procedures for inspection by attributes of discrete items. The plans are indexed in terms of the producer's risk point and the consumer's risk point. Therefore, they can be used not only for the purposes of acceptance sampling, but for a more general purpose of the verification of simple statistical hypotheses for proportions. The purpose of this International Standard is to provide procedures for sequential assessment of inspection results that may be used to induce the supplier, through the economic and psychological pressure of non-acceptance of lots of inferior quality, to supply lots of a quality having a high probability of acceptance. At the same time, the consumer is protected by a prescribed upper limit to the probability of accepting lots of poor quality. ISO 28591:2017 provides sampling plans that are applicable, but not limited, to inspection in different fields, such as: - end items, - components and raw materials, - operations, - materials in process, - supplies in storage, - maintenance operations, - data or records, and - administrative procedures. ISO 28591:2017 contains sampling plans for inspection by attributes of discrete items. The sampling plans may be used when the extent of nonconformity is expressed either in terms of proportion (or percent) nonconforming items or in terms of nonconformities per item (per 100 items). The sampling plans are based on the assumption that nonconformities occur randomly and with statistical independence. There may be good reasons to suspect that one nonconformity in an item could be caused by a condition also likely to cause others. If so, it would be better to consider the items just as conforming or not, and ignore multiple nonconformities. The sampling plans from this International Standard should primarily be used for the analysis of samples taken from processes. For example, they may be used for the acceptance sampling of lots taken from a process that is under statistical control. However, they may also be used for the acceptance sampling of an isolated lot when its size is large, and the expected fraction nonconforming is small (significantly smaller than 10 %). In the case of the acceptance sampling of continuing series of lots, the system of sequential sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection published in ISO 2859‑5 should be applied.

  • Standard
    46 pages
    English language
    sale 10% off
    e-Library read for
    1 day
  • Standard
    39 pages
    English language
    sale 15% off
  • Standard
    39 pages
    English language
    sale 15% off
  • Standard
    39 pages
    French language
    sale 15% off
  • Standard
    39 pages
    French language
    sale 15% off
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.

  • Standard
    41 pages
    English language
    sale 15% off
  • Standard
    41 pages
    English language
    sale 15% off
  • Standard
    41 pages
    French language
    sale 15% off
  • Standard
    41 pages
    French language
    sale 15% off
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.

  • Standard
    17 pages
    English language
    sale 10% off
    e-Library read for
    1 day
  • Standard
    11 pages
    English language
    sale 15% off
  • Standard
    11 pages
    English language
    sale 15% off
  • Standard
    11 pages
    French language
    sale 15% off
  • Standard
    11 pages
    French language
    sale 15% off