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The underlying assumption of our approach is that journals of a particular size and focus have a scope that corresponds to specialties. By measuring the similarity between (1) the baseline classification and (2) multiple classifications obtained by topic clustering and using different values of a resolution parameter, we have identified a best performing ACPLC. In two case studies, we could identify the subject foci of the specialties involved, and the subject foci of specialties were relatively easy to distinguish. Further, the class size variation regarding the best performing ACPLC is moderate, and only a small proportion of the articles belong to very small classes. For these reasons, we conclude that the proposed methodology is suitable for determining the specialty granularity level of an ACPLC. <\/jats:p>","DOI":"10.1162\/qss_a_00004","type":"journal-article","created":{"date-parts":[[2019,8,29]],"date-time":"2019-08-29T18:16:35Z","timestamp":1567102595000},"page":"207-238","update-policy":"https:\/\/doi.org\/10.1162\/mitpressjournals.corrections.policy","source":"Crossref","is-referenced-by-count":20,"title":["Granularity of algorithmically constructed publication-level classifications of research publications: Identification of specialties"],"prefix":"10.1162","volume":"1","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4442-1360","authenticated-orcid":true,"given":"Peter","family":"Sj\u00f6g\u00e5rde","sequence":"first","affiliation":[{"name":"University Library, Karolinska Institutet, Stockholm, Sweden"},{"name":"Health Informatics Centre, Department of Learning, Informatics, Management and Ethics, Karolinska Institutet, Stockholm, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0229-3073","authenticated-orcid":true,"given":"Per","family":"Ahlgren","sequence":"additional","affiliation":[{"name":"Department of Statistics, Uppsala University, Uppsala, Sweden"},{"name":"KTH Library, KTH Royal Institute of Technology, Stockholm, Sweden"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"281","reference":[{"issue":"1","key":"bib1","doi-asserted-by":"crossref","first-page":"49","DOI":"10.1016\/j.joi.2008.11.003","volume":"3","author":"Ahlgren P.","year":"2009","journal-title":"Journal of Informetrics"},{"issue":"12","key":"bib2","doi-asserted-by":"crossref","first-page":"3095","DOI":"10.1002\/asi.23568","volume":"67","author":"Bauer J.","year":"2016","journal-title":"Journal of the Association for Information Science and Technology"},{"issue":"3","key":"bib3","doi-asserted-by":"crossref","first-page":"377","DOI":"10.1007\/s11192-006-0118-9","volume":"68","author":"Besselaar P. van den","year":"2006","journal-title":"Scientometrics"},{"key":"bib4","volume-title":"Analysis of a Decade in Library Literature: 1994\u20132004 | Blessinger | College & Research Libraries","author":"Blessinger K."},{"issue":"2","key":"bib5","doi-asserted-by":"crossref","first-page":"999","DOI":"10.1007\/s11192-017-2297-y","volume":"111","author":"Boyack K. 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