IRS13 Summary summary Harvard University Gerard Salton Use, reproduction, or publication, in whole or in part, is permitted for any purpose of the United States Government. hand modifications are made to the ADI queries and the resulting improve- ments in retrieval effectiveness are exhibited. Comparisons are also made between certain automatic search procedures and manual searches using a K[OCRerr]TC type index. A full summarization of all recall and precision tables for all collections and all search experiments is included in appendix A. Appendix B contains a listing of the 35 ADI requests for both original forms and hand-modified versions. It is hoped that some of the evaluation results presented in this report may lead to the design of more effective fully-automatic retrieval systems in the foreseeable future. G. Salton xvii