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<Paper uid="P88-1022">
  <Title>TWO TYPES OF PLANNING IN LANGUAGE GENERATION</Title>
  <Section position="2" start_page="0" end_page="0" type="intro">
    <SectionTitle>
Abstract
</SectionTitle>
    <Paragraph position="0"> As our understanding of natural language generation has increased, a number of tasks have been separated from realization and put together under the heading atext planning I. So far, however, no-one has enumerated the kinds of tasks a text planner should be able to do. This paper describes the principal lesson learned in combining a number of planning tasks in a planner-realiser: planning and realization should be interleaved, in a limited-commitment planning paradigm, to perform two types of p\]annlng: prescriptive and restrictive. Limited-commitment planning consists of both prescriptive (hierarchical expansion) planning and of restrictive planning (selecting from options with reference to the status of active goals).</Paragraph>
    <Paragraph position="1"> At present, existing text planners use prescriptive plans exclusively. However, a large class of p\]anner tasks, especially those concerned with the pragmatic (non-literal) content of text such as style and slant, is most easily performed under restrictive planning. The kinds of tasks suited to each planning style are listed, and a program that uses both styles is described.</Paragraph>
  </Section>
class="xml-element"></Paper>