An SLDS is a software tool allowing communication
via voice in order to perform a certain task
• According to the goal of the task one can identify:
– Transaction-based systems which allow the user to perform
a transaction (e.g. reserving a seat in a train, buying or
selling stocks)
– Information-provision systems which provide information as
answer to a query (e.g. weather information, timetables for
a train)
• The output can be in form of synthesised voice or
some data