1) RITMARE is a large, multi-institutional Italian marine research project aiming to build a data management infrastructure to facilitate sharing of data across research communities. 2) Subproject 7 of RITMARE seeks to design an IT system that enables interoperability and data exchange without forcing a single model or centralization. Efforts have included developing a data policy, collecting researcher requirements, and creating tools and services. 3) While progress has been made in establishing nodes providing access to data and metadata, uptake by researchers has been less than expected due to insufficient technical support, lack of data-related incentives, and developing a data policy after the project began rather than at the outset.