Developing interactive systems is very expensive. This stems from the fact that, in average, 50--60 per cent of the lines of code in an application are for dialog management [Sutto77]. Therefore, dialog development has been recognized as an important area both among researchers and practitioneers. As a result, many tools have been developed, or are under development, with the aim of reducing the dialog design and implementation efforts, and hence, reducing the costs.
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Stefan Britts (1987) studied this question.
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