CRANV1P1 Comments chapter Cyril Cleverdon Jack Mills Michael Keen Cranfield An investigation supported by a grant to Aslib by the National Science Foundation. Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. - 117 - next stage of the work, there was probably an error of judgement in putting so much effort into the preparation of the single-term hierarchies. It is doubtful if anyone has previously attempted to compile classification schedules consisting entirely of '-'.ingle words, and it proved to be a very difficult, but therefore very interesting task. It was right that, in this project, the attempt should have been made, but an earlier realisation of the limited affect which the schedules would have on the performance of the system would have led to a decision that less time should be expended in their preparation. The main objective of the test is to ascertain the effort of various index language devices on the performance of information retrieval systems. To conclude this volume, it is reasonable to claim that, although there are some operations which might have been done better another way, nothing has happened seriously to militate against the possibility of achieving this test objective.