The document discusses using a hub and spoke model to connect biobanks in Europe. Key points: - A hub and spoke structure will be used with federated databases where hubs provide database services and routing of queries at central access points. - Hubs can focus on different data types like genotypes, phenotypes, samples, or metadata. - A common schema will allow different national hubs to connect. - Work package 5 aims to develop standards for identifiers, communication between biobanks, and a shared lexicon/terminology. - Challenges include changing data definitions, integration of different data types, and dealing with natural language differences between countries.