CRANV2 Test Environment chapter Cyril Cleverdon 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. - 30 - approximately the same number of rc!evant documents as the original 23 searches. For this group of results, therefore, the figures at the cooi'dination level of 2 have been estimated by doubling the total obtained for the 23 questions. Similar procedures have been used in other cases. This can certainly be considered somewhat unsatisfactory, and it could be argued that it would have been preferable not to have attempted to obtain figures by such a dubious method. However, it is felt that they do have some value; in every case where any such action is taken, an asterisk is placed against the figure or the ratio, and, if the reader feels so inclined, these results can be ignored. As can be seen from the example of Figs. 2.14 and 2.15, each table of results contains details of the environment in which the test was carried out. This includes the particular index language, the level of exhaustivity, the search rule, the level of relevance, the number of documents and questions, the number of relevant documents, and the generality number. The latter, and the meaning of x in the tables, is considered in Chapter 3.