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Explanation is an interactive process requiring a dialogue between advice-giver and advice-seeker. In this paper, we argue that in order to participate in a dialogue with its users, a generation system must be capable of reasoning about its own utterances and therefore must maintain a rich representation of the responses it produces. We present a text planner that constructs a detailed text plan, containing the intentional, attentional, and .,,e~,~nc~ ~tructures of the text it generates. | PLANNING TEXT FOR ADVISORY DIALOGUES Johanna. D. Moore UCLA Department of Computer Science and use Information Sciences Institute 4676 Admiralty Way Marina del Rey CA 90292-6695 USA Cécile L. Paris USC Information Sciences Institute 4676 Admiralty Way Marina del Rey CA 90292-6695 USA ABSTRACT Explanation is an interactive process requiring a dialogue between advice-giver and advice-seeker. In this paper we argue that in order to participate in a dialogue with its users a generation system must be capable of reasoning about its own utterances and therefore must maintain a rich representation of the responses it produces. We present a text planner that constructs a detailed text plan containing the intentional attentional and rhetorical structures of the text it generates. INTRODUCTION Providing explanations in an advisory situation is a highly interactive process requiring a dialogue between advice-giver and adviceseeker Pollack et al. 1982 . Participating in a dialogue requires the ability to reason about previous responses e.g. to interpret the user s follow-up questions in the context of the ongoing conversation and to determine how to clarify a response when necessary. To provide these capabilities an explanation facility must understand what it was trying to convey and how that information was conveyed i.e. the intentional structure behind the explanation including the goal of the explanation as a whole the subgoal s of individual parts of the explanation and the rhetorical means used to achieve them. Researchers in natural language understanding have recognized the need for such information. In their work on discourse analysis Grosz and Sidner 1986 argue that it is necessary to represent the intentional structure the attentional structure knowledge about which aspects of a dialogue are in focus at each point and the linguistic structure of The research described in this paper was supported by the Defense Advanced Research Projects Agency DARPA under a NASA .
