dialogue, as a form of interaction, is not limited to speech and language even though this is often our first interpretation of the term "dialogue."... the concepts of dialogue are applicable across modalities.
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FSMs, as formal accounts of dialogue, are limited to transitions in a dialogue. They do not make assumptions about the way options or feedback are presented to the user. The same FSM could be implemented as an interface in multiple ways. FSMs do not make explicit assumptions about the user, either: FSMs are mute about how users perceive, reason, learn, and experience.
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Formal models of computation are suitable for describing discrete, moded dialogues. A mode refers to the variation in the interpretation of a user's input according to an internal state.
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The model subscribes to a theoretical assumption about dialogue: The defining cognitive challenge in dialogue is understanding the communication partner such that the appropriate next turn can be taken. In other words, the dialogue is intentional or goal-directed: Users aim to drive the computer to a particular desired state.
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