The review aimed to identify Open Science (OS) services, skills and competencies needed to support the researcher in her interaction with research infrastructure, seen from the European perspective and the (Danish) university library perspective. The purpose was to outline which challenges and possibilities there are for university libraries in their future work with OS, specifically how to identify the competencies needed to provide library services supporting OS.The review consists of five chapters. Chapter 1 introduces the terms and concepts used throughout the review. OS seen from a European university and research library perspective is discussed in Chapter 2, where ground-breaking roadmaps for competence development such as LIBER and LERU are presented. In Chapter 3, the conceptual model illustrating the DEFF project’s understanding of services supporting the Open Research Ecosystem is presented. The model focuses on the main phases a researcher, in a research project, goes through. These are defined in the three sequential phases: planning, active research and publishing, with the underlying research activities of data discovery, data management, collecting & creating data, processing data, analyzing data, writing, scholarly communication, data publishing and providing access to research (data). To understand how the services identified in the model can be translated into skill and competence development, in Chapter 4 we analyze existing frameworks for Open Science education and training. This analysis includes the Edison Data Science framework, EOSC Skills and Capability Framework), The Open Science Skills Working Group Report and the matrices and models these three frameworks build on. Finally, in Chapter 5, the findings from the previous chapters are combined in a proposed 7-step model to aid libraries identify the competencies required to provide specific OS support services.