ISO INTERNATIONAL STANDARD 18391 First edition 2016-10-01 Geometrical product specifications (GPS) Population specification Spécification géométrique des produits (GPS) Spécification de population Reference number ISO 18391:2016(E) ISO International Organization for Standardization @IS02016 No reproduction or networking permitted without license from IHS IS0 18391:2016(E) COPYRIGHT PROTECTED DOCUMENT IS0 2016, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form 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 Internatinir DrganizationforStandardization networking permited without license from IHS IS0 18391:2016(E) Contents Page Foreword ..iv Introduction. .. 1 Scope. ..1 2 Normative references 3 Terms and definitions ..1 4 Rules for establishing a population specification .3 4.1 General .3 4.2 Rules. .3 4.2.1 Rule 1: Description of a population specification. .3 4.2.2 Rule 2: Description of type of individual GPS specification (univariate or multivariate) .5 4.2.3 Rule 3 7 5 Symbol used to specify a population specification ..8 6 Rules for indicating a population specification ..11 Annex A (informative) Relation in the GPS matrix model ..15 Bibliography ..16 ii ithout license from IHS