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GUS, A Frame-Driven Dia|og System



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ARTIFICIALINTELLIGENCE 155 GUS A Frame Driven Dia og System D a n i e l G Bobrow Ronald M Kaplan Martin Kay D o n a l d A N o r m a n H e n r y T h o m p s o n and Terry Winograd Xerox Palo Alto Research Center 3333 Coyote Hill Road Palo Alto CA 94304 U S A Recommended by Don Walker ABSTRACT G U S is the first o f a series o f experimental computer systems that we intend to construct as part o f a program of research on language understanding In large measure these systems will fill the role o f periodic progress reports summarizing what we have learned assessing the mutual coherence o f the various lines o f investigation we have been following and saggestin where more emphasis is needed in future work GUS Genial Understander System is intended to engage a sympathetic and highly cooperative human in an English dialog directed towards a specific goal within a very restricted domain o f discourse As a starting point G US was restricted to the role o f a travel agent in a conversation with a client who wants to make a simple return trip to a single city in California There is good reason for restricting the domain o f discourse for a computer system which is to engage in an English dialog Specializing the subject matter that the system can talk about permiis it to achieve some measure o f realism without encompassing all the possibilities o f human knowledge or o f the English language It also provides the user with specific motivation for participating in the conversation thus narrowing the range o f expectations that GUS must have about the user s purposes A system restricted in this way will be more able to guide the conversation within the boundaries o f its competence 1 Motivation and Design Issues Within its limitations ous is able to conduct a more or less realistic dialog But the outward behavior of this first system is not what makes it interesting or significant There are after all much more convenient ways to plan a trip and unlike some other artificial



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