ISO INTERNATIONAL STANDARD 21511 First edition 2018-05 Work breakdown structures for project and programme management Organigramme des taches en management de projet et de programme Reference number IS0 21511:2018(E) [so International Organization for Standardization Shenzhen Insttute of Standards and Technology 9972181 @IS02018 IS0 21511:2018(E) COPYRIGHTPROTECTEDDOCUMENT @IS02018 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 internetoranintranet, without priorwrittenpermission.Permission canberequested from either Iso at the address below or Iso's member body in the country of the requester. ISO copyright office CP 40i : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ganizationfor Standardization icensee-Shenzhen Institute of Standards andecISogf1&- All rights reserved rious National Standards Bodies Not for Resale, 2018/9/30 03:25:3 IS0 21511:2018(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..1 3 Terms and definitions ..1 4 Work breakdown structure concepts .3 4.1 General .3 4.2 Purpose. .3 4.3 Context .3 4.4 Hierarchical decomposition. .4 4.5 Parent-child relationships 4 4.6 Progressive elaboration 4 5 Work breakdown structure characteristics, development and relationships to other structures 5 5.1 Characteristics of a work breakdown structure. .5 5.2 Development. .5 5.2.1 General .5 5.2.2 Creation 6 5.2.3 Description of the project or programme work breakdown structure elements... .6 5.2.4 Composition ofthe workbreakdown structure dictionary. 7 5.2.5 Integration of multiple work breakdown structures. 7 5.3 Work breakdown structure relationships .8 5.3.1 General 8 5.3.2 Relationship to organizational breakdown structure .8 5.3.3 Relationship to contracts .8 5.3.4 Relationship to functional areas. ..8 5.3.5 Relationship to other structures 9 5.4 Control of work breakdown structure .9 5.5 Uses and benefits of the work breakdown structure. .9 5.5.1 Uses of the work breakdown structure. 9 5.5.2 Benefits from the work breakdown structure ..10 Annex A (informative) Work breakdown structures ) Examples ..11 Annex B (informative) Links with other breakdown structures -Examples ..18 Annex C (informative) Alternatives hierarchical work breakdown structures ..21 Bibliography .23 iii Shenzhen Institute of Standards and Technology 9972181