Abstract
In this paper we introduce a formal model of dialogue based on grammar systems theory: Conversational Grammar Systems (CGS). The model takes into account ideas from the study of human-human dialogue in order to define a flexible mechanism for coherent dialogues that may help in the design of effective and user-friendly computer dialogue systems. The main feature of the model is to present an action view of dialogue. CGS model dialogue as an inter-action, this is a sequence of acts performed by two or more agents in a common environment. We claim that CGS are able to model dialogue with a high degree of flexibility, which means that they are able to accept new concepts and modify rules, protocols and settings during the computation.
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