Open access initiatives in European countries: analysis of trends and policies.

Purpose: This paper aims to analyze open access (OA) scholarly publishing patterns as well as OA policies and mandates across European countries. Design/methodology/approach: The study is based on a descriptive research approach using data from Web resources, directories and bibliographic and citation databases, namely, DOAJ, OpenDOAR, SCImago journal and Country Ranking portal, ROARMAP and Web of Science. Findings: The findings indicate that the initiatives and measures in Europe that promote OA are adequate. OA journals and digital repositories have progressively increased over the past two decades. Of the total journals (n = 25,231) published worldwide and indexed in Scopus, 53% are published in European countries, with 23.7% being OA journals. In total, 34% of the OA repositories (n = 5,714) are in European countries. The proportion of OA journal papers has grown significantly in all European countries, with a 14.3% annual growth rate. The average proportion of OA publications in European countries is significantly higher (39.07%) than the world average (30.16%), with a clear inclination for making research literature openly accessible via the green OA route (79.41%) compared to the gold OA route (52.30%). Most European research funders and institutions have required researchers to make OA available for their research findings, either by publishing them in OA journals or depositing accepted manuscripts in repositories. Research limitations/implications: The study analyzed OA trends in Europe; other continents and countries were not included in the analysis. The study only described OA policies and mandates; the extent to which the OA policies and mandates were implemented was not studied. However, the results of the study may be helpful to policymakers, funders, research institutions and universities in other countries in adopting and implementing OA policies and mandates. Originality/value: To the best of the authors' knowledge, the study is the first that used multiple data sources for investigating different facets of OA publishing in European countries, including OA journals, digital repositories, research output, mandates and policies for publicly funded research. The findings will be helpful for researchers and policymakers interested in promoting OA adoption among researchers worldwide. [ABSTRACT FROM AUTHOR]