The present comparative study examines the three main multidisciplinary bibliographic databases, Web of Science Core Collection, Scopus, and OpenAlex, with the aim of providing up-to-date evidence on coverage, metadata quality, and functional features to help inform strategic decisions in research assessment. The report is structured into two complementary methodological sections. First, it presents a systematic review of recent scholarly literature that investigates record volume, open-access coverage, linguistic diversity, reference coverage, and metadata quality; this is followed by an original bibliometric analysis of the 2015-2024 period that explores longitudinal distribution, document types, thematic profiles, linguistic differences, and overlap between databases. The text concludes with a ten-point executive summary and five recommendations.

翻译：本研究对三大跨学科文献数据库——Web of Science核心合集、Scopus与OpenAlex——展开比较分析，旨在通过提供关于收录范围、元数据质量及功能特性的最新实证依据，为科研评估中的战略决策提供参考。报告由两个互为补充的方法论部分构成：首先系统综述了近期探讨文献体量、开放获取覆盖度、语言多样性、参考文献覆盖率及元数据质量的学术文献；继而通过2015-2024年间的原创文献计量分析，深入探究了各数据库在时间分布、文献类型、主题特征、语言差异及相互重叠度等方面的表现。文末附有十点执行摘要与五项具体建议。