In order to provide quick and user-friendly public services to citizens and businesses, public administrations are trying to adopt customer-centric approaches and readjust their ways of working. One way to achieve efficiency and increase user-friendliness is through the ‘once-only principle’. Instead of asking the citizen for information that they have already provided, public administrations will reuse the information theyalready have. Much of this information is stored in authoritative databases called base registries. As the authentic sources of data for public administrations, base registries are one of the basic building blocks of public services and are the key to making the once-only principle a reality. The good practices presented in this paper, are grouped according to the layered interoperability model proposed by the European Interoperability Framework (EIF), as depicted below.
| LEGAL | ||||
| Compliance with legislation | Bridging Legislation | Service terms and conditions | Data sharing principles | |
| ORGANISATIONAL | ||||
| Organisational Structures | Collaboration | Service level policies | Governance processes | Business models |
| SEMANTIC | ||||
| Vocabularies | Code lists | Glossaries | Identifiers | |
| TECHNICAL | ||||
| Network for data transport | Interconnection architecture | Standards for data exchange | Security |
Good practices on building successful interconnections of Base Registries:
Legal level
Organisational level
Semantic level
Technical level
