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Inf. Syst."],"published-print":{"date-parts":[[2025,5,31]]},"abstract":"<jats:p>Legal case retrieval is an important task in information retrieval that aims to retrieve relevant cases for given query cases. Conversational search paradigms have been shown to improve the search experience in legal case retrieval. However, there are two challenges in applying conversational search to legal scenarios. Firstly, legal search conversations often focus on different parts of legal case documents, but existing models struggle to capture the complex structural information and extract accurate relevance signals. Secondly, collecting large-scale conversational search datasets is costly, making it difficult to build reliable conversational legal case retrieval models. To address these challenges, we propose a Structure-Aware Matching Model (SAMM) for conversational legal case retrieval. SAMM extracts matching signals between conversational utterances and segments of the legal cases to incorporate structural information. We decouple the conversational search task into three subtasks and design pre-training tasks to overcome the lack of training data. Additionally, we create ConvLegal, the largest conversational legal case retrieval dataset to the best of our knowledge, for better evaluation of different methods. We train and evaluate SAMM and baselines on both a public dataset (CLCR) and ConvLegal. Experimental results demonstrate that SAMM outperforms existing models in legal case retrieval and conversational search.<\/jats:p>","DOI":"10.1145\/3711854","type":"journal-article","created":{"date-parts":[[2025,1,16]],"date-time":"2025-01-16T12:17:36Z","timestamp":1737029856000},"page":"1-28","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Structure-Aware Conversational Legal Case Retrieval"],"prefix":"10.1145","volume":"43","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9445-5123","authenticated-orcid":false,"given":"Bulou","family":"Liu","sequence":"first","affiliation":[{"name":"Quan Cheng Laboratory, Department of Computer Science and Technology, Institute for Internet Judiciary, Tsinghua University and School of Law, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-7986-3692","authenticated-orcid":false,"given":"Yiran","family":"Hu","sequence":"additional","affiliation":[{"name":"Quan Cheng Laboratory, Department of Computer Science and Technology, Institute for Internet Judiciary, Tsinghua University and School of Law, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5030-709X","authenticated-orcid":false,"given":"Qingyao","family":"Ai","sequence":"additional","affiliation":[{"name":"Quan Cheng Laboratory, Department of Computer Science and Technology, Institute for Internet Judiciary, Tsinghua University and School of Law, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2539-8954","authenticated-orcid":false,"given":"Yueyue","family":"Wu","sequence":"additional","affiliation":[{"name":"Quan Cheng Laboratory, Department of Computer Science and Technology, Institute for Internet Judiciary, Tsinghua University and School of Law, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0140-4512","authenticated-orcid":false,"given":"Yiqun","family":"Liu","sequence":"additional","affiliation":[{"name":"Quan Cheng Laboratory, Department of Computer Science and Technology, Institute for Internet Judiciary, Tsinghua University and School of Law, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3144-6374","authenticated-orcid":false,"given":"Chenliang","family":"Li","sequence":"additional","affiliation":[{"name":"School of Cyber Science and Engineering, Wuhan University, Wuhan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0831-7371","authenticated-orcid":false,"given":"Fan","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Information Management, Wuhan University, Wuhan, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-7539-4242","authenticated-orcid":false,"given":"Weixing","family":"Shen","sequence":"additional","affiliation":[{"name":"School of Law, Tsinghua University, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1417-2295","authenticated-orcid":false,"given":"Chong","family":"Chen","sequence":"additional","affiliation":[{"name":"Huawei Cloud BU, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7252-5047","authenticated-orcid":false,"given":"Qi","family":"Tian","sequence":"additional","affiliation":[{"name":"Huawei Cloud BU, Beijing, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"320","published-online":{"date-parts":[[2025,3,17]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1145\/3583780.3614812"},{"key":"e_1_3_2_3_2","first-page":"1","volume-title":"2nd International Workshop on Conversational Approaches to Information Retrieval","author":"Azzopardi Leif","year":"2018","unstructured":"Leif Azzopardi, Mateusz Dubiel, Martin Halvey, and Jeffery Dalton. 2018. 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