ISO INTERNATIONAL STANDARD 9241-221 First edition 2023-08 Ergonomics of human-system interaction - Part 221: Human-centred design process assessment model Ergonomie de I'interaction homme/systeme- Partie 221: Modele d'évaluation de processus de conception centreée sur I'opérateur Reference number ISO 9241-221:2023(E) ISO IS02023 IS0 9241-221:2023(E) COPYRIGHTPROTECTED DOCUMENT @IS02023 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 or ISoO'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 Email:[email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2023- All rights reserved