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<Paper uid="E99-1037">
  <Title>Dialogue Processing in a CALL-System</Title>
  <Section position="5" start_page="255" end_page="255" type="concl">
    <SectionTitle>
4 Conclusion
</SectionTitle>
    <Paragraph position="0"> The aim of this concept is to provide a foreign language learner with exercises that enhance his/her communicative ability. One important module in the system is the diMogue component itself which organizes e.g. the turntaking in a dialogue. At least two knowledge sources are necessary for limited flexibility and reusability. The structure of a dialogue can be handled by a discourse grammar whereas the content of a diMogue is stored into an (expandable) knowledge base. To add new dialogues, only the dialogue knowledge base and the surrounding discourse grammar have to be updated whereas the other specialized discourse grammars can be reused. The structure of the dialogue knowledge base could also allow for the handling of questions and multi-sentence answers given by the learner. Nodes in the tree do not only represent variables to be instantiated by the learner, but might also include knowledge the system can provide to the learner.</Paragraph>
    <Paragraph position="1"> The kind of dialogue component presented here allows for 1) easy maintainance and expansion with new dialogues, 2) advanced feedback to the learner and 3) flexible and pedagogically sound exercises which enhance the process of aquiring 'communicative competence'.</Paragraph>
  </Section>
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