SP500207 Appendix C: System Features appendix National Institute of Standards and Technology Donna K. Harman S([OCRerr]ftware Inlprovenlent.%: I. Pr([OCRerr]er U.%C ([OCRerr] RAM t')r h[OCRerr].'hing. 2. Use of a DOS extender or switch t([OCRerr] an OS/2 or UNIX environment. 3. What features IS your system missing that ii would beuefit by if it had them? The follE'wing software improvements would l[OCRerr]neflt the retrieval performance: 1. Relevance Feedback 2. Larger Semantic Lexicon 3. Breakdown of Lexicon into noun, verb, adjective, adverb, preposition, conjuncti[OCRerr]'n, intei[OCRerr]jection, use coupled with a part of speech tagger. 483