IRE Ineffable concepts in information retrieval chapter Nicholas J. Belkin Butterworth & Company Karen Sparck Jones All rights reserved. No part of this publication may be reproduced or transmitted in any form or by any means, including photocopying and recording, without the written permission of the copyright holder, application for which should be addressed to the Publishers. Such written permission must also be obtained before any part of this publication is stored in a retrieval system of any nature. 58 Ineffable concepts in information retrieval 32. MCGILL, M. J. Knowledge and information spaces: implications for retrieval Systems, Journal of the American Society for Information Science 27, 205-210 (1976) 33. COOPER, w. 5. The paradoxical role of unexamined documents in the evaluation of retrieval effectiveness, Information Processing and Management 12, 367-76 (1976) 34. ODDY, R. N. Information retrieval through man-machine dialogue, Journal of Documentation 33, 1-14(1977) I- i I i i 4