ISO INTERNATIONAL STANDARD 21931-2 First edition 2019-05 Sustainability in buildings and civil engineering works - Framework for methods of assessment of the environmental, social and economic performance of construction works as a basis for sustainability assessment - Part 2: Civil engineering works Développement durable dans la construction Cadre méthodologique de I'evaluation au sens du développement durable des performances environnementales, sociales et économiques des ouvrages de construction- Partie 2: Ouvrages de génie civil Reference number ISO 21931-2:2019(E) ISO @ IS0 2019 IS0 21931-2:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 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 internet or an intranet, without prior 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 CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 21931-2:2019(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normative references ..2 3 Terms and definitions .2 4 Principles for the sustainability performance assessment of civil engineering works. ..7. 5 Framework for methods of assessment of sustainability performance of civil engineering works 9 5.1 General, .9 5.2 Assessment method documentation .9 5.3 Purpose of the method 10 5.4 System boundary 10 5.5 Statement of assumptions and scenarios 11 5.6 Establishing assessment categories 12 5.7 Civil engineeringworks lifecycle 13 5.8 Methods for quantification of sustainability performance of civil engineering works 17 5.8.1 General 17 5.8.2 Data quality 17 5.8.3 Traceability and transparency .17 5.8.4 Double-counting. .18 5.8.5 Functional equivalent ..18 5.8.6 Reference levels 19 5.8.7 Aggregation .19 5.8.8 Weighting 19 5.9 Sources of information 19 5.10 Evaluation of assessment results 20 5.10.1 General 20 5.10.2 Comparability of the results 20 5.11 Assessment report. 20 Annex A (informative) Levels ofaggregation .23 Bibliography .25 @ IS0 2019 - All rights reserved iii