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The Once-Only Principle : The TOOP Project
The TOOP Book aims to describe and document the developments and results of theOnce-Only Principle Project (TOOP). The once-only principle (OOP) is a concept inthe broader context of e-government that aims to ensure that business, citizens, andother organisations have to provide specific information to administrations and govern-mental authorities only once. The principle was defined as one of the key enablers fore-Government in Europe by the Tallinn Declaration on e-Government at the ministerialmeeting during the Estonian Presidency of the Council of the EU on 6 October 2017. However, these exchanges require public administrations to have a certain degree of trustin each other, which is built on a shared legal basis. Together with the organisationaland technical concepts of the OOP, the first time in the history of the EU, a specific hor-izontal, non-sector legal framework for the direct exchange of digital evidence betweenpublic administrations in different Member States and associated countries was created.This legal basis for the EU is the Single Digital Gateway Regulation.TOOP was launched by the European Commission in January 2017 within Horizon2020 research and innovation programme. The approach of the EC, Member Statesand associated countries was to introduce TOOP as the large-scale project for research,testing and implementation of the OOP in Europe.The main objective of TOOP was to explore and demonstrate the OOP across borders,focusing on data from businesses. The OOP is one of the underlying principles statedin the European Union’s eGovernment Action Plan 2016–2020, as well as the SingleDigital Gateway Regulation. The application of the OOP is the prerequisite for buildingmodern and user-friendly digital services. An important concept to realize the OOP isfrom a technical point of view the interconnection of base registries. Such registries aredefined as being the consolidated source of information for specific domains, such asbusiness, properties, persons, etc. The concept of OOP then means using base registriesas information sources that always keep the latest version, and that can provide infor-mation on request or subscription. Tosupporttheactiveorinterestedpartnersinpiloting,agenericreferencearchitecturefor TOOP (TOOPRA) was developed. A reference architecture is a set of standardizedenterprise Architectures that provides a frame of reference for a particular domain, sector,or field of interest [1]. The TOOPRA is offered to be used by architects responsible forthe design of cross-border solution architectures.During the lifetime of the project more than 50 organisations from more than 20 EUMember States and associated countries were part of the TOOP consortium, includinga number of academic and research institutions.1Caused by the number of partners in the project, a specific structure was developedto ensure on the one side the participation and involvement and on the other side tokeep the administration simple and manageable. The partners of the TOOP consortiumparticipated in the project as so-called national consortia via a lead beneficiary.
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