Stakeholder Community

Once-Only Principle for Citizens

What is Once-Only?

The once-only principle aims at eliminating the administrate burden when citizens are required to provide the same information again and again to public administrations. Instead, public administrations should have the means to re-use information already supplied by citizens in a transparent and secure way.


When the once-only principle is widely applied, it significantly reduces the administrative burden on citizens. Also, citizens gain better control over their information when it is provided to public administrations only once. Moreover, it helps public administrations work faster, more transparently and efficiently.


Privacy and data protection of citizen's information as well as transparency regarding the use of such information are key to sustainably applying the once-only principle. Likewise, technological interoperability between public administrations and the legislative framework are crucial for facilitating the re-use of information.

Once-Only Principle

simply explained

Recent News

Tue, 21 Mar 2017, 10:00
The Digital Services Interoperability (ISA²) programme of the European Commission has nominated multiple projects based on the Once-Only Principle (OOP) for its Sharing and Reuse Award.
Tue, 14 Mar 2017, 12:10
The first thematic SCOOP4C workshop titled "Ensuring comprehensive coverage in the collection of Once-Only Principle (OOP) cases" took place in Brussels. A lot of interesting OOP-cases from different European countries were presented.

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