Abstract
In this paper a theory of dialogue structure of tas k oriented conversations and its associated tagging scheme are presented. The theory introduces two linguistic str uctures supporting the dialogue that, following tra ditional terminology, we call the obligations and common ground. The theory is illustrated with the detailed an alysis of a transaction. We also describe the empirical work su pporting the theory, as well as an evaluation task. The paper is concluded with a reflection on the relation of the present theory to traditional notions of obligation s and grounding, its relation to a more general theory of discourse and conversation and its potential application to t he construction of spoken natural language systems.
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