Context From March to September 2022, the «Platinum Open Access Funding» Project (PLATO), in collaboration with the Institute for Applied Data Science & Finance at the Bern University of Applied Sciences, undertook a bibliometric and empirical study of the Platinum/Diamond open access journal landscape in Switzerland. The PLATO project is an initiative of six Swiss universities – the University of Zurich, the University of Bern, the University of Geneva, the University of Neuchâtel, the Zurich University of the Arts and ETH Zurich –, dedicated to furthering community-led scholarly publishing in Switzerland. Diamond open access stands for a concept of equitable open access to and participation in scholarly publishing that is free for both authors and readers. Presentation The main objective of the PLATO Study was to gain insight into the Platinum/Diamond open access publishing ecosystem in Switzerland through a mixed-method approach. The study consisted of three parts: First, bibliometric data were combined with inputs from Swiss open access publishers, institutional open access experts as well as information on journal websites to identify Swiss Diamond OA journals and their main characteristics. Second, seven semi-structured interviews with editors of select Diamond OA journals were conducted to generate a thorough understanding of their workflows, infrastructures, business models, challenges and opportunities. Third, based on the inputs from the interviews, three surveys were designed and sent to authors/reviewers, editors, and representatives of hosting and funding institutions of Swiss Diamond OA journals. The results of the study are published in the form of the following outputs: DOI Report: 10.5281/zenodo.7461728 DOI Bibliometric List: 10.34914/olos:l2tys6tie5f63h35lqpqzzlx24 DOI Data Set: 10.5281/zenodo.7461754 The Data Set comprises the following files: Survey questionnaires SurveyQuestionnaire_Author.pdf SurveyQuestionnaire_Editor.pdf SurveyQuestionnaire_Publisher.pdf Data collected in three survey studies addressing journal editors, authors/reviewers as well as representatives of hosting and funding institutions: StudyData_Author.csv StudyData_Editor.csv StudyData_Publisher.csv Codebooks explaining the coding of the survey data files: StudyCodebook_Author.pdf StudyCodebook_Editor.pdf StudyCodebook_Publisher.pdf

The «Platinum Open Access Funding» Project (PLATO) is co-financed by swissuniversities.