ISO INTERNATIONAL STANDARD 4259-4 First edition 2021-12 Petroleum and related products - Precision of measurement methods and results - Part 4: Use of statistical control charts to validate 'in-statistical-control' status for the execution of a standard test method in a single laboratory Produits pétroliers et connexes - Fidelité des méthodes de mesure et de leurs reésultats - Partie 4: Utilisation de cartes de controle statistique pour valider I'etat 'sous maitrise statistique'pour I'exécution d'une méthode d'essai normalisée dans un seul laboratoire Reference number IS0 4259-4:2021(E) ISO @ IS0 2021 IS0 4259-4:2021(E) COPYRIGHT PROTECTED DOCUMENT @IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved