Matheson, Colin

Matthew, Hednerson

Oberlander, Jon

English

Spoken dialogue systems can encounter different types of errors, including nonunderstanding errors where the system recognises that the user has spoken, but does not understand the utterance. Strategies for dealing with this kind of error have been proposed and tested in the context of goal-driven dialogue systems, for example by Bohus with a system which helps reserveconference rooms (Bohus and Rudnicky, 2005). However there has been littlework on possible strategies in more conversational settings where the dialogue has more open-ended intentions. This paper looks at recovery from non-understanding errors in the context of a robot tourguide, and tests the strategies in a user trial. The results suggest that it is beneficial for userenjoyment to use strategies which attempt to move the dialogue on, rather than getting caught up in the error by asking users to repeat themselves

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