An analysis of dialogues with our dialogue system through a WWW page

Many researchers have been developing natural language dialogue systems as a human-friendly man-machine interface. The human factors in a man-machine dialogue, however, are not obvious enough to understand with regard to how people talk with a dialogue system. 141 dialogues which our dialogue system had in DiaLeague '97 were analyzed at the utterance and dialogue levels, where DiaLeague '97 was the second dialogue contest in which a dialogue system engaged in a dialogue with a human in order to solve a speci c problem. For the analyses at the utterance level, we investigated the users' speaking styles, the richness of the users' utterances in a variety of surface patterns, and the in uence of the system's utterance pattern on the users' utterance. For the analyses at the dialogue level, we investigated the instances of confusion observed in the 141 dialogues and we also show how the users behaved when the confusion occurred.