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              <p>Analyser les changements de sujet dans les conversations ayant un but. Le sujet d'une conversation joue un role crucial dans sa cohérence globale car ce qui est discuté à un moment donné limite les contributions possibles des participants. Lancer un nouveau sujet de conversation alors que le précédent est encore en cours de discussion peut être une source de confusion en l'absence de signaux appropriés. Cependant, la notion de sujet de conversation est débattue en linguistique et n'est pas suffisamment abordée en modélisation du dialogue. Une description précise de cette notion ainsi que de celle de changement de sujet permettrait de comprendre ce que nous percevons lorsque nous jugeons comme cohérente une séquence d'interventions. Afin d'analyser les différents types de changements de sujet, nous proposons de créer un corpus de conversations ayant un but (discussion du dilemme éthique de la montgolfière), où les conversations sont des échanges de messages écrits. Ces discussions limitées thématiquement vont nous permettre de comprendre les changements de sujet dans les dialogues.</p>
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