ISO 28598-2 INTERNATIONAL STANDARD edition First2017-10 Acceptance sampling procedures based on the allocation of priorities principle (APP) 一 Faqrdinated single sampling plans for acceptance sampling by attributes Regles d'echantillonnage pour acceptation fondees sur le principe d'attribution de priorités (APP)- Partie 2: Plans d'eéchantillonnage simple coordonnes pour I'echantillonnagepouracceptation parattributs Reference number IS0 28598-2:2017(E) so @ISO 2017 IS028598-2:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland AHbyghty raeansedlalestronicotherwipemifieldlanilaitdfitdisgpplbbicatbpyimgyoltqnsthgintprndtioedntnttiaiaet) otimeamyisowithout 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. fsodeBparigbt Afics 3·CP401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 [email protected] 47 www.iso.org ii @ IS0 2017 - All rights reserved IS028598-2:2017(E) Contents Foreword 1 2 3 4 5 5.3 Preferredrequirements. 5 6 6.1.2 Supplementary 6 7 8 9 9.2.1 Descriptionpercent nonconforming 10 10 10.2.1 Knownlevels 12 11 @ IS0 2017 - All rights reserved ili Page Introduction vii Scope 1 Normative references 1 Terms, definitions, symbols and abbreviations 2 Terms and definitions. 23 3.1 3.2 Symbols and abbreviations Selection from among sampling systems by attributes 4 4.1 Relationship between sampling systems 4 4.2 Suitable environments for appiying IS0 28598-2 4 Lot quality 5 5.1 Lot quality measures 5 5.2 Satisfactoryand unsatisfactory lots 5 5.4 Types of NQLs 5.5 Disposition of unsatisfactory lots 5 Limits for other party's risk 6 6.1 Supplier's sampling plans. 6.1.1 Assignmentofa customer's risk on supplier inspection 6.1.3 Trust levels trustlevels 6.2 Customer's sampling plans 6 6.3 Permissible sampling plans. 8 Inspecting party's risk 6 7.1 Supplier's sampling plans. 7.2 Customer's sampling plans Basic data 9 8.1 Supplier's sampling plans. 8.2 Customer's sampling plans 9 Catalogue of permissible sampling plans 9.1 Compositionoftables 9 9.2 Tables for supplier permissible single sampling plans 10 Tables forof supplier single samplingtables 9.2.3 Tablesfor nonconformities per100 items 11 9.2.4 Tableentries... 11 [m Choosing supplier's single sampling plans .11 10.1 Rules for choosing permissible single sampling plans 11 10.2 Recommendations on selecting a preferred plan fromthosepermissiblefor T2 and T3 trust estimate of a lot quality level 10.2.2Knownstandard orestimateofaprocessqualitylevel .12 Choosing customer's single samplingplans .12 .12 11.1 General recommendations.. 11.2 Useofcustomer's sampling tablesforknown sample size 12 IS0 28598-2:2017(E) 12 SamplinginspectionforNQL=0 .13 AnnexA (normative)Tablesforacceptancesinglesamplingplansbyattributes .14 AnnexB (informative) Examples ofapplication of catalogued permissible sampling plans. .42 Annex C (informative)Theoretical justification. .46 Bibliography .51 iv @IS0 2017 - All rights reserved IS028598-2:2017(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards thudiegh(IsO tecamicet boabiesytasewofkdf pitapaeingbodyInitteretitedaihStandbjeetisoowhidlycarrtiechaital committeehas been established has therighttoberepresentedon that committee.International organizations, governmentaland non-governmental, in liaison with IsO,alsotake part in the work. IsOcollaboratescloselywiththe electrotechnical standardization.International Electrotechnical Commission (IEC) on all matters of The procedures used to develop this document and those intended for its further maintenance are editorial rules of the Iso/IEC Directives, Part 2 (see www.iso.org/directives): Ratentionrights.dfswstannbpbsbhayrponsibhefolemasntryfg alyhshdocmhstefghssubject of anypat ntsidentifiedduringthed ductionand on the Iso listofpatentdeclarations received (see www.iso.org/patents). Any trade used in this co