Towards a Cross-Border Reference Architecture for the Once-Only Principle in Europe: An Enterprise Modelling Approach

  • Jaak TepandiEmail author
  • Eric Grandry
  • Sander Fieten
  • Carmen Rotuna
  • Giovanni Paolo Sellitto
  • Dimitris Zeginis
  • Dirk Draheim
  • Gunnar Piho
  • Efthimios Tambouris
  • Konstantinos Tarabanis
Conference paper
Part of the Lecture Notes in Business Information Processing book series (LNBIP, volume 369)


The Once-Only Principle states that citizens and businesses provide data only once in contact with public administrations. So far, many European countries have started to implement the Once-Only Principle at national level, but its cross-border implementation is still fragmented and limited. This paper presents the development of a Reference Architecture for the Once-Only Principle in Europe. The case study, stemming from the EU-funded Once-Only Principle project (TOOP) highlights the challenges faced by the architecture team when developing the Reference Architecture that tackles the Once-Only Principle across different countries and policy domains. The architecture is not built from scratch, but re-uses and enhances already available building blocks in order to seamlessly preserve interoperability and to comply with regulations and existing technical standards, leaving at the same time enough space for vendors and open source developers to propose their compliant solutions, whatever is their business model.


Once-Only Principle EU Single Digital Gateway Reference Architecture TOOP EU Building Blocks TOOPRA 



This work was supported by the European Union Horizon 2020 research and innovation program (The Once-Only Principle Project, grant agreement no 737460). The authors would like to thank the three anonymous reviewers for their suggestions and comments.


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Copyright information

© IFIP International Federation for Information Processing 2019

Authors and Affiliations

  • Jaak Tepandi
    • 1
    Email author
  • Eric Grandry
    • 2
    • 3
  • Sander Fieten
    • 4
  • Carmen Rotuna
    • 5
  • Giovanni Paolo Sellitto
    • 6
  • Dimitris Zeginis
    • 7
    • 8
  • Dirk Draheim
    • 1
  • Gunnar Piho
    • 1
  • Efthimios Tambouris
    • 7
    • 8
  • Konstantinos Tarabanis
    • 7
    • 8
  1. 1.Information Systems GroupTallinn University of TechnologyTallinnEstonia
  2. 2.Luxembourg Institute of Science and TechnologyLuxembourg CityLuxembourg
  3. 3.Ministry of Mobility and Public WorksLuxembourg CityLuxembourg
  4. 4.Holodeck B2BLeidenThe Netherlands
  5. 5.ICI BucharestBucharestRomania
  6. 6.ANACRomeItaly
  7. 7.Centre for Research and Technology HellasThessalonikiGreece
  8. 8.University of MacedoniaThessalonikiGreece

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