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We show that argumentation theory, a branch of AI concerned with the resolution of disagreements, provides a powerful toolbox with which we can represent and reason about such debates. After summarising the relevant ideas of argumentation theory, we overview three recent contributions from the authors and their collaborators: (1) on how to automatically identify reply polarity (agreement or disagreement) between arguments submitted in online debates, (2) on locating where the justified arguments are likely to be and how that depends on the \"degree of antagonism\" of the debate, and (3) on how to present the arguments made in debates such that a reader would get as many of the justified arguments as possible without having to read the entire debate. We hope that this will lead to further work that applies argumentation theory to model and analyse online debates.<\/jats:p>","DOI":"10.1145\/3533274.3533278","type":"journal-article","created":{"date-parts":[[2022,5,12]],"date-time":"2022-05-12T22:19:43Z","timestamp":1652393983000},"page":"1-9","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":3,"title":["Modelling online debates with argumentation theory"],"prefix":"10.1145","volume":"2022","author":[{"given":"Anthony P.","family":"Young","sequence":"first","affiliation":[{"name":"King's College London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sagar","family":"Joglekar","sequence":"additional","affiliation":[{"name":"King's College London, London, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Vibhor","family":"Agarwal","sequence":"additional","affiliation":[{"name":"University of Surrey, Guildford, Surrey, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Nishanth","family":"Sastry","sequence":"additional","affiliation":[{"name":"University of Surrey, Guildford, Surrey, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2022,5,12]]},"reference":[{"key":"e_1_2_1_1_1","doi-asserted-by":"publisher","DOI":"10.1145\/3485447.3512144"},{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1257\/jep.31.2.211"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1804840115"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1145\/3452936"},{"key":"e_1_2_1_5_1","doi-asserted-by":"crossref","unstructured":"Cabrio E. and Villata S. 2018. Five Years of Argument Mining: a Data-driven Analysis. In IJCAI. Vol. 18. 5427--5433.  Cabrio E. and Villata S. 2018. Five Years of Argument Mining: a Data-driven Analysis. In IJCAI. Vol. 18. 5427--5433.","DOI":"10.24963\/ijcai.2018\/766"},{"key":"e_1_2_1_6_1","unstructured":"Caminada M. 2008. A Gentle Introduction to Argumentation Semantics.  Caminada M. 2008. A Gentle Introduction to Argumentation Semantics."},{"volume-title":"On the Acceptability of Arguments in Bipolar Argumentation Frameworks. In European Conference on Symbolic and Quantitative Approaches to Reasoning and Uncertainty. Springer, 378--389","author":"Cayrol C.","key":"e_1_2_1_7_1","unstructured":"Cayrol , C. and Lagasquie-Schiex , M . -C. 2005 . On the Acceptability of Arguments in Bipolar Argumentation Frameworks. In European Conference on Symbolic and Quantitative Approaches to Reasoning and Uncertainty. Springer, 378--389 . Cayrol, C. and Lagasquie-Schiex, M.-C. 2005. 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