http://data.europa.eu/2sa/elap/once-only Citizens and businesses provide public administrations data only once Rationale Requesting the data multiple times leads to an unnecessary administrative burden for citizens and businesses. It also leads to multiple administrations of the same data, with a high risk of inconsistency and low data quality. It is essential that the data that public administrations use is of good quality, in order to prevent errors and delays in processes and provide high-quality services. Principle Source Once Only Principle of DIGITAL Europe