IRE Types of test part 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. 104 Types of test simulation testing in information retrieval, and Cooper concludes the section with a chapter putting the advantages of gedanken experimentation. As in Part 1, there are many examples of individual tests intended to provide concrete illustrations of the problems encountered and methods adopted in the different types of test. I