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<Paper uid="M91-1032">
  <Title>UNISYS : DESCRIPTION OF THE UNISYS SYSTEM USED FOR MUC- 3</Title>
  <Section position="7" start_page="221" end_page="221" type="concl">
    <SectionTitle>
CONCLUSIONS
</SectionTitle>
    <Paragraph position="0"> The value of the three-tiered approach realized in the Unisys MUC-3 system is two-fold . First, the terrorist domain is sufficiently well-defined that a deep linguistic analysis is often unneccessary, and usin g linguistic analysis sparingly provides a dramatic improvement in robustness and processing time . Second, in the MUC-3 evaluation task we have discovered that a small amount of modeling effort, i .e., writing KBIRD rules, produces a significant improvement in our ability to extract pertinent information . Since KBIRD is a forward chaining rule-driven methodology, the creation, modification and removal of rules i s a very easy and intuitive process .</Paragraph>
    <Paragraph position="1"> The three-tiered approach of combining traditional information retrieval and linguistic analysis techniques with the type of analysis that our knowledge-based information retrieval system, KBIRD, provide s offers significant advantages to solving common text processing problems . The modularity of this approach allows us to utilize advances made in keyword analysis and NLP technology with relative ease .</Paragraph>
  </Section>
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