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

Best-Practice Showcase

  • - Ongoing


    The Hellenic (National) Citizens’ Registry will be the base registry (authentic source) hosting and serving citizens’ civil and municipal status information. A central infrastructure (hardware and software) will be developed. More specifically, an Information System (Citizens’ Registry), owned by the Ministry of Interior, will be implemented that will be based on a web n-tier architecture.…
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  • - Ongoing


    ELGA stands for electronic health records. ELGA is an information system that simplifies the process of accessing the citizens health records for the citizen and their doctors, as well as other health care professionals at hospitals, care facilities and pharmacies. Health data such as a patient’s test results are generated by a variety of health institutions. ELGA networks all of them and makes…
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  • - Ongoing


    In the past, parents had to go to six different public agencies to carry out their duties and to be entitled to receive family allowance. Since the 1st of May 2015 the new once-only process is implemented. In this procedure, nine public services are integrated so that the parents have to visit only the Civil Registry Office and have to bring along (standard-case parents) no evidences except their…
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Recent News

Wed, 10 May 2017, 14:46
The European Commission proposed to establish a Single Digital Gateway that shall serve as a single point of access to public services provided by EU Member States. The new Gateway will rely heavily on the “Once-Only Principle” (OOP).
Thu, 13 Apr 2017, 14:12
As part of the conference, SCOOP4C will organize a workshop on the question how the Once-Only Principle (OOP) can reduce administrative burden. The session takes place from 09:30-18:00.

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