This project joins LIP as the leading proponent and ICS and INCD as co-proponents. These organizations are complementary and have well-established open science and research data management competencies. They also supplement each other in the coverage of scientific areas. ICS brings relevant data repositories and long-standing experience in the stewardship of data from social sciences, making this field the main thematic area to be addressed. LIP will cover the areas of particle physics and social physics while bringing knowledge from participation in EOSC projects, augmented with experience in managing large volumes of research data. INCD, as a digital research infrastructure, supports all fields of science and technology and has the capability to house institutional or thematic data repositories closely coupled with cloud and high-performance computing (HPC) capacity. This unique combination will enable easier archival of data from research and the exploitation and reuse of open data using cloud, HPC, and big data analytics. In addition, it will also ease the deployment of complementary tools and services. The project will build upon the ICS and LIP experience in managing research data and research data repositories according to the principles of open science and FAIR data. The project will create a thematic data repository for social sciences customized to the requirements of this scientific domain. The data from APIS, the Portuguese Archive of Social Information, managed by ICS, will be migrated and consolidated into this new thematic repository, which will be openly available to social sciences researchers. In addition, LIP will establish and manage a repository for particle physics and LIP research data. The repositories will be aligned with the POLEN repository as a reference framework. Therefore, this contributes to the growth of an interoperable network of data repositories under the coordination of FCT. The repositories will be housed at INCD using its infrastructure services. Future exploitation of this model by INCD is expected in areas such as agriculture, earth observation, and climate among others. Policies and practices for the management and sharing of research data will be established at the institutional level in the proponent organizations, aiming to increase the adhesion to the FAIR data principles and promote the use of open data repositories. In addition, dissemination, training and education activities will be developed to boost literacy in open science and remove adoption barriers. Participation in the future national network of data stewards will provide the necessary integration. At the same time, communication and dissemination towards other research centers in the supported areas will foster adoption and impact. Finally, the project will ensure alignment with best practices in open science and FAIR principles by liaising with EOSC and exploiting synergies with EOSC projects ongoing at LIP and INCD, as well as by coordinating its activities with FCT, the national consortium, and other relevant initiatives at national and international level.