ISO INTERNATIONAL STANDARD 21351 First edition 2005-05-15 Space systems Functional and technical specifications Systemes spatiaux - ( Cahierdeschargesfonctionneletspecification techniquedebesoin Reference number ISO 21351:2005(E) @ ISO 2005 ed by IHS ur itted without license from IHS Not for Resale ISO 21351:2005(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is atrademarkof Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In @ISO2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either isO at the address below or IsO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland CopyightInternatinal organization for Standardization @ISO2005-Allrightsreserved vithout license from IHS Not for Resale ISO 21351:2005(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeen International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEc Directives, Part 2. The main task of technical committees is to prepare International Standards. 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of paten rights. isO shall not be held responsible for identifying any or all such patent rights. ISO21351 was prepared by the European Committee for Standardization (CEN) in collaboration with Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 14, Space systems and operations, in accordance with the Agreement on technical cooperation between Iso and CEN (Vienna Agreement) Standard..". ii ISO 21351:2005(E) Contents Page Foreword. vi Introduction ..vii 1 Scope.. 2 Normative references 3 Terms, definitions and abbreviations.... 3.1 Terms and definitions ... 3.2 Abbreviated terms .... 4 Functional specification and technical specification purpose and description ..... 4.1 Functional specification purpose and description .... 4.2 Technical specification purpose and description .... 4.3 FS and TS content ....... 5 Process for establishing a functional specification and a technical specification .. 5.1 5.2 Process for establishing a functional specification.... 5.3 Process for establishing a technical specification ... 6 Technical requirements description.. 6.1 General description ... 6.2 Identification of attributes assigned to technical requirements. 6.2.1 Introduction.... 6.2.2 Functional requirements description . 6.2.3 Missionrequirementsdescription.. 6.2.4 Interface requirements description.... 6.2.5 Environmental requirements description . 6.2.6 Physical requirements description.. 6.2.7 Operational requirements description.. .10 6.2.8 Humanfactorrequirements description. 6.2.9 (Integrated) logistics support requirements description ... .10 6