CRANV2 Main test results 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. 148 - Section 7 Simple Concepts:- Recall Devices The simple concept languages are tested by the 42 questions (subset 2) searched on the 200 collection (subset 1). Fifteen separate languages are presented in the tables, 4.700T - 4.714T. Index language I.l.a uses the basic natural terms, and index language 1.2.a incorporates the recall device of synonym control. All subsequent index languages are based on index language 1.2.a, Index languages 1.3.a, 1.4.a, 1.5.a, 1.6.a, 1.7.a and 1.8.a investigate different selections of classes based on the schedules as given in Appendix 5.4 of Volume I. Index languages 1.9.a, 1.10.a and 1.11.a represent selections from the alphabetical index as given in Appendix 5.5 of Volume I. Index languages I. 12.a, I. 13.a and 1.14.a investigate the complete classes of the schedules of Appendix 5.4, while index language I. 15.a brings in both the alphabetical and the hierarchical languages. A table presenting the fifteen languages and their relationships appears as Figure 2.6. (page 10). Seven graphs are included in this section, each plotting two or more of the sets of test results; these graphs fall into three main groups and provide comparison of (1) the different hierarchical devices, including the selective and obligatory types, (Figs. 4.715P, 4.716P, 4.718P, 4.719P and 4.7.21P). (2) the alphabetical device, (Figs. 4.717P and 4.721P). (3) hierarchical and alphabetical devices (Figs. 4.719P and 4.721P). LIST OF FIGURES Index No. of Document Document Language Questions Subset Collection 4. 700T II. 1 .a 42 2 200 4. 701T II. 2.a 42 2 200 4. 702T II. 3.a 42 2 200 4. 703T II.4.a 42 2 200 4. 704T II. 5. a 42 2 200 4. 705T II. 6.a 42 2 200 4. 706T II'. 7.a 42 2 200 4. 707T II. 8. a 42 2 200 4. 708T II. 9 .,a 42 2 200 4. 709T II. 10.a 42 2 200 4. 710T II. ll.a 42 2 200 4. 711T II. 12.a 42 2 200