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We distinguish between static (SIS) and dynamic (DIS)information states of a dialogue agent. The dynamic state is the partof the information state which can change during the course of thedialogue, while the static state stays the same. In the static statewe can include rules for interpreting utterances, updating the dynamicinformation state, and selecting further moves. Also, we can includedialogue move definitions, plan libraries, dialogue game definitions(e.g. in the form of Finite State Transition Networks) and domaindatabases, insofar as these knowledge sources do not change during thedialogue. If e.g. the database can be updated during the dialogue byinformation from the user or in any other way, or if the system iscapable of learning new rules, these resources should be included inthe dynamic state.
Staffan Larsson10/11/1999
