ISO 28597 INTERNATIONAL STANDARD edition First2017-10 Acceptance sampling procedures by attributes Specified quality levels in nonconforming items per million Regles d'echantillonnagepar attributs en vue d'acceptation- Niveaux specifies de qualite en termes d'individus non conformes pour unmilliond'individus ISoRebseceoumbEy @IS02017 IS028597:2017(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 copyright@iso.org 47 www.iso.org ii @ IS0 2017 - All rights reserved IS028597:2017(E) Contents Page Foreword iv Introduction. .vi Scope 2 Normative references 1 3 Terms, definitions, symbols and abbreviated terms 4 General principles 2 4.1 Objective 4.2 Qualityassessmentofproduct 2 5 Estimation ofquality levels in nonconforming itemspermillion items 3 5.1 .3 Prerequisites 5.2 Datasources 3 5.3 Eatipitig ofeqy itheenenasprqced stguliekedines. 5.5 Examples ofestimationofthequalitylevel 5.5.1 Exampleforsingledatasource 5.6 5.6.1 Reporting fraction nonconforming in nonconforming items per million items. 5.6.2 Period of data accumulation. 5 6 Lot acceptance sampling requirements and procedures 5 6.1 Overview .5 6.2 Requirements and guidelines. 6:4 Lotillusraptansserpreadra 6 6.4.1 Assessed process quality levelfalls in a given interval for the selected LQL 6.4.2 Assessed process qualitylevel does not fall in agiven interval forthe selected LQL 7 Single sampling plans indexed by LQL in nonconforming items per million items. 8 Annex A (normative) Data exclusion .12 (informative) Underlying theory forgenerating point estimates of quality levelin 15 Annex Bfractionnonconforming Annex C (informative) Statistical theory and calculation of Table 1 .17 Bibliography 19 @ IS0 2017- All rights reserved iii