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<Paper uid="P86-1032">
  <Title>A MODEL OF PLAN INFERENCE THAT DISTINGUISHES BETWEEN THE BELIEFS OF ACTORS AND OBSERVERS</Title>
  <Section position="11" start_page="212" end_page="213" type="concl">
    <SectionTitle>
CONCLUSION
</SectionTitle>
    <Paragraph position="0"> In this paper I demonstrated that modeling cooperative conversation, in particular cooperative question-answcring, requires a model of plan inference that distinguishes between the beliefs of actors and those of observers. I reported on such a model, which rests on an analysis of plans as mental phenomena. Under this analysis there can be discrepancies between an agent's own beliefs and the beliefs that she ascribes to an actor when she thinks he has some plan. Such discrepancies were associated with the observer's judgement that the actor's plan is invalid. Then the types of any invalidities judged to be present in a plan inferred to underlie a query were shown to affect the content of a cooperative response. 1 further suggested that, to  guarantee a cooperative response, the observer must attempt to ascribe to the questioner more than just a set of beliefs and intentions sufficient to believe that he has some plan: she must also attempt to ascribe to him beliefs that explain those beliefs and intentions. The eplan construct was introduced to capture this requirement. Finally, I described the process of inferring eplans--that is, of ascribing to another agent beliefs and intentions that explain his query and can influence a response to it.</Paragraph>
  </Section>
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