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In the present effort, while providing a taxonomy to distinguish between search-based versus learning-based approaches, we survey graph-based studies from the search-based category, motivated as they comprise the mainstream. We present a unifying and vetted overview of the various definitions in this realm, scrutinize assumptions, and identify shortfalls. We start by reviewing initial approaches to the Expert Team Formation problem to lay the conceptual foundations and set forth the necessary notions for a more grounded view of this realm. Next, we provide a detailed view of graph-based Expert Team Formation approaches based on the objective functions they optimize. We lay out who builds on whom and how algorithms have evolved to solve the drawbacks of previous works. Furthermore, we categorize evaluation schemas and elaborate on metrics and insights that can be drawn from each. Referring to the evaluation schemas and metrics, we compare works and propose future directions.<\/jats:p>","DOI":"10.1145\/3737455","type":"journal-article","created":{"date-parts":[[2025,5,24]],"date-time":"2025-05-24T07:22:43Z","timestamp":1748071363000},"page":"1-40","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["A Survey of Subgraph Optimization for Expert Team Formation"],"prefix":"10.1145","volume":"57","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6297-3794","authenticated-orcid":false,"given":"Mahdis","family":"Saeedi","sequence":"first","affiliation":[{"name":"School of Computer Science, University of Windsor","place":["Windsor, Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6861-4821","authenticated-orcid":false,"given":"Hawre","family":"Hosseini","sequence":"additional","affiliation":[{"name":"Thomson Reuters","place":["Toronto, Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-2889-808X","authenticated-orcid":false,"given":"Christine","family":"Wong","sequence":"additional","affiliation":[{"name":"School of Computer Science, University of Windsor","place":["Windsor, Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6033-6564","authenticated-orcid":false,"given":"Hossein","family":"Fani","sequence":"additional","affiliation":[{"name":"School of Computer Science, University of Windsor","place":["Windsor, Canada"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"320","published-online":{"date-parts":[[2025,7,12]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1137\/1.9781611972832.65"},{"key":"e_1_3_2_3_2","doi-asserted-by":"crossref","first-page":"839","DOI":"10.1145\/2187836.2187950","volume-title":"Proceedings of the 21st International Conference on World Wide Web","author":"al. 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