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A labelling proposal to annotate dialogues. Proceedings of the Third International Conference on Language Resources and Evaluation, 2002. pp. 1566-1582.Stochastic models are widely used in some fields of Language Technology. Dialogue systems are one interesting application in Language Technology. In recent years, the stochastic modelling approach of dialogue systems has gained interest. These stochastic models are estimated from a set of annotated dialogues. The definition of the set of labels to annotate dialogues is therefore an important issue in the development of stochastic dialogue models. We propose a set of labels, which is composed of three levels, and a set of rules for using them. The application of this labelling to a specific set of dialogues is reported. The adequacy of the set of labels for stochastic modelling is also demonstrated.