GUIDE 98-6 First edition 2021-02 Uncertainty of measurement Part 6: Developing and using measurement models Incertitude de mesure Partie 6: Elaboration et utilisation de modeles de mesure Reference number IS0/IEC GUIDE 98-6:2021(E) IEC ISO IS0/IEC2021 IS0/IECGUIDE98-6:2021(E) COPYRIGHTPROTECTEDDOCUMENT @IS0/IEC2021 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 below or Iso's member body in the country of the requester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii IS0/IEC2021-Allrights reserved IS0/IECGUIDE98-6:2021(E) ISO/IEC Foreword ISo (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)form the specialized system for worldwide standardization.National bodies that are members of Iso or IEC participate in the development of International Standards through technical committees established bytherespective organizationto deal with particularfields oftechnicalactivity Iso and IEC technical committees collaborate in fields of mutual interest. Other international organizations,governmental and non-governmental, in liaison with IsO and IEC, also take part in the work. The procedures used to develop this document and those intended for its further maintenance are described in the IsO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of document should be noted. This document was drafted in accordance with theeditorialrulesofthe ISo/IECDirectives,Part2(seewww.iso.org/directives or www.iec.ch/memhers_ experts/refdocs). Attention is drawn to thepossibility that some of the elements of this documentmaybe the subject of patent rights.ISOand IEC shall not be heldresponsible for identifying any or all such patent rights.Details ofanypatent rights identified duringthe development ofthe document will beintheIntroduction and/or on the ISo list of patent declarations received (see www.iso.org/patents) or the IEC list of patent declarations received (see patents.iec.ch) Any trade name used in this document is information given for the convenience of users and does not constitutean endorsement. For an explanation of the voluntary nature of standards, the meaning of Iso specific terms and expressions related to conformity assessment, as well as information about Iso's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT),see www.iso.org/iso/foreword.html. In the IEC, see www.iec.ch/understanding-standards. This document was prepared by Working Group 1 of the Joint Committee for Guides in Metrology (as JCGM GUM-6:2020),and was adopted by the national bodies of ISOand IEC. Alistofallparts intheISO/IECGuide98seriescanbefound on theISOandIEC websites. Given that ISO/IEC Guide 98-6 is identical in content to JCGM GUM-6, the decimal symbol is a point on the line in the English version. Annex Zz has been appended to provide a list of corresponding ISo/IEC Guides and JCGM guidance documents for which equivalentsare notgiven inthe text. Anyfeedback or questions on this document should be directed to the user's national standards body.A complete listing of these bodies can befound at www.iso.org/members.html and www.iec.ch/national- committees. @ IS0/IEC 2021-All rights reserved iii