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<Paper uid="W99-0314">
  <Title>Automatically Extracting</Title>
  <Section position="2" start_page="0" end_page="0" type="intro">
    <SectionTitle>
1 Introduction
</SectionTitle>
    <Paragraph position="0"> The annotation scheme (AC97) developed by the  Forward-Looking Group (henceforth referred to as the BF scheme) provides a set of tags that can be applied to individual utterances in a dialogue, describing the utterance's illocutionary force. The BF scheme provides a standard top-level tag set that allows researchers to reuse corpora that have been annotated for other projects, and also allows tags to be refined by individual projects to provide detail on particular phenomena being studied.</Paragraph>
    <Paragraph position="1"> There are a number of dialogue features that are of interest to researchers, and for which tagging schemes have been developed. One feature that we are concerned with is grounding, the mechanism by which dialogue participants augment their mutual beliefs. In his dissertation work (Tra94), Traum establishes a set of tags to describe grounding behavior, and then uses this taxonomy of grounding acts to describe a computational model of how dialogue participants achieve a state of mutual understanding. Traum's model describes how grounding acts can be combined to form discourse units, segments of a dialogue that correspond to individual contributions to the common ground. Clark and Schaefer define a Grounding Tags</Paragraph>
  </Section>
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