• The CSA should execute at least two use cases to demonstrate and promote the use of the federation services provided by the EOSC Core Platform (EU Node) and document the experience and lessons learned. The use cases should be driven by real-life user needs and consider the long-term sustainability of such federations. The use cases should include Research Infrastructures able to federate within EOSC and users which gain novel capabilities for their research work.
• Through the outcomes of the use cases, the CSA should propose to the EC and current EOSC governance a set of operational Rules of Participation and common set of policies and minimum requirements to be applied consistently across the EOSC federation.
• This set of rules, policies and requirements should be detailed in such a way they can be introduced in the operation of ESFRI, ERICs and other international, national or institutional RIs at the subdomain, domain and interdisciplinary levels as concerns the EOSC federation.
• They should be developed, maintained, and updated in accordance with the progressive deployment of the EOSC Core, EOSC Exchange and EOSC sustainability models and be based on latest input by the Task Forces of the EOSC Association and any additional, relevant input by the research community.

Proposals are expected to cover the following activities:

• The CSA should explore concrete use cases of federations of Research Infrastructures and data/service providers to the EOSC Core Platform (EU Node). The CSA should contribute to the further evolution of the Rules of Participation and Acceptable Use Policies based on the identification of specific commitments and needs of the different contributors of the EOSC federation, and contribute to the related development of guidelines and recommendations on various aspects (incl. interoperability framework), and with this further promote the EOSC Core Platform (EU Node). This work should be done in close collaboration with relevant stakeholders, such as the contractors providing the Managed Services for the European Open Science Platform (EU Node), Research Infrastructures, thematic EOSC communities and EOSC national nodes.

To this end, the CSA should engage with and further build the EOSC federation community, and assist in the development of a common framework on the various aspects of the federation, including the following dimensions:

• Legal
• Business model and incentive structure
• Interoperability framework, including the support for FAIR principle and handling of PIDs across EOSC federation
• EOSC Authentication and Authorization Infrastructure
• EOSC Security Coordination
• EOSC Rules of Participation.

Coordination and collaboration with the Data Spaces Support Centre (DSSC) is required in order to take stock of identified common data infrastructure requirements, including technologies, processes, standards, and tools that will allow reuse of data across the various data spaces. Also, synergies should be established with the contractors of SIMPL as foreseen in the latter’s procurement technical specifications, to avoid duplicating efforts and funding among major Union initiatives.