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As the next generation networks (5G) move into a direction of virtualization and softwarization, using technologies like Software-Defined Networking (SDN) and Network Function Virtualization (NFV), one of the main benefits is the possibility of network resource sharing among different tenants and service providers. This paper focuses on how the architecture of the 5G NORMA project will tackle the issue of resource sharing. Two main areas will be explored: how to achieve efficient resource sharing among network slices, and specific solutions used by the architecture to allow for resource sharing.