TAILIEUCHUNG - Báo cáo khoa học: "EMPIRICAL STUDIES OF DISCOURSE REPRESENTATIONS FOR NATURAL LANGUAGE INTERFACES"

We present the results from a series of experiments aimed at uncovering the discourse structure of man-machine communication in natural language (Wizard of Oz experiments). The results suggest the existence of different classes of dialogue situations, requiring computational discourse representations of various complexity. Important factors seem to be the number of different permissible tasks in the system and to what extent the system takes initiative in the dialogue. | EMPIRICAL STUDIES OF DISCOURSE REPRESENTATIONS FOR NATURAL LANGUAGE INTERFACES Nils Dahlbăck Ame Jdnsson Natural Language Processing Laboratory Department of Computer and Information Science_ Linkõping University S-581 83 LINKỐPING SWEDEN Internet NDA@ ARJ@ Phone 46 13281644 46 13281717 ABSTRACT We present the results from a series of experiments aimed at uncovering the discourse structure of man-machine communication in natural language Wizard of Oz experiments . The results suggest the existence of different classes of dialogue situations requiring computational discourse representations of various complexity. Important factors seem to be the number of different permissible tasks in the system and to what extent the system takes initiative in the dialogue. We also analyse indexical expressions and especially the use of pronouns and suggest a psychological explanation of their restricted occurrence in these types of dialogues. INTRODUCTION Natural Language interfaces will in the foreseeable future only be able to handle a subset of natural language. The usability of this type of interfaces is therefore dependent on finding subsets of natural language that can be used without the user experiencing inexplicable holes in die system performance . finding subsets for which we can computationally handle complete linguistic and conceptual coverage. This points to the need for theories of the sublanguage or sublanguages used when communicating with computers Kittredge and Lehrberger 1982 . But unfortunately we have no well-developed linguistics of natural-language man-machine communication. von Hahn 1986 p. 523 One way of tackling this problem is to simulate the man-machine dialogue by letting users communicate with a background system through an interface which they have been told is a natural language interface but which in reality is a person simulating such a device sometimes called a Wizard of Oz experiment see Guindon Shuld-berg and Conner 1987

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