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Handling Failures in Human-Computer Conversation
Handling Failures in Human-Computer Conversation
Tim Paek
Department of Psychology
Stanford University
Stanford, CA 94305
U.S.A.
paek@psych.stanford.edu
Abstract. Uncertainty plays a central role in the handling of failures in conversation.
People manage uncertainty by establishing and maintaining the mutual belief that their
utterances have been understood well enough for current purposes, a process referred to
as grounding. In this paper, we propose a computational architecture for supporting
grounding in human-computer spoken dialog. We delineate four levels of analysis and
describe representations and inference procedures for resolving key uncertainties that
may lead to communication failures. We illustrate the architecture by reviewing inter-
actions between a user and a prototype spoken dialog system called the Bayesian Re-
ceptionist.
Keywords: Bayesian Receptionist, Conversation, Decision Theory, Human-Computer
Interaction, Misunderstanding, Spoken Dialog
1. Introduction
When people engage in a conversation, they typically do so with the intent of making
themselves understood. To do this they need to make sure, as they speak, that the other
participants are at the same time attending to, hearing, and understanding what they are
saying. Since uncertainty about these aspects can result in communication failures,
people collaborate to establish and maintain the mutual belief that their utterances have
been understood well enough for current purposes (Clark and Schaefer, 1987, 1989).
An example of this process is feedback. To establish the mutual belief that an utterance
was sufficiently understood, people will give feedback of their understanding through
head nods or acknowledgements, such as “uh huh.” If they do not understand, they will
try to clear up their uncertainties. In short, people coordinate not only what they say but
also their beliefs about what they mutually understand.
Researchers in linguistics, psychology, and artificial intelligence have argue
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