ISO INTERNATIONAL STANDARD 13879 First edition 1999-10-15 Petroleum and natural gas industries Content and drafting of a functional specification Industries du pétrole et du gaz naturel Redaction et contenu d'unespecificationfonctionnelle ISO Reference number ISO 13879:1999(E) by IHS under lic itted without license from IHS Not for Resale ISO 13879:1999(E) Contents 1 Scope 2 Normative referenc 3 Terms and definitions 4 Guidelines for drafting .. 4.1 Objective of a functional specification. 4.2 Format of a functional specification. 5 Framework, structure and content.... 5.1 General arrangement. 5.2 Preliminary elements. 5.3 General normative elements.. 5.4 Functional normative elements 5.5 Supplementary elements . .6 Annex A (informative) Frequently asked questions. Bibliography. @ISO1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic International OrganizationforStandardization Casepostale56·CH-1211Geneve20·Switzerland Internet [email protected] Printed in Switzerland Not for Resale ISO 13879:1999(E) @ ISO Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO committees. Each member body interested in a subject for which a technical committee has been established has liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote International Standard ISO 13879 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum and natural gas industries. Annex A of this International Standard is for information only. ili oeaionalganizationfStandardizati Not for Resale