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The Once-Only Principle project (TOOP) is an initiative, financed by the EU Program Horizon 2020, with the aim to explore and demonstrate the Once-Only principle through multiple sustainable pilots, using a federated architecture on a cross-border collaborative pan-European scale, enabling the connection of different registries and architectures in different countries for better exchange of information across public administrations. The deployed systems in the different Member States for the different piloting domains are being monitored and tested following the TOOP testing methodology that was developed during the TOOP project and with the use of specifically developed TOOP tools in order to monitor, identify errors and improve the quality of the pilots. The specific piloting tests and milestones are customized per pilot domain and are followed by all Member States piloting in the specific domain. The methodology starts from a technical view at the own Member State level with the verification of a check list, continues with onboard testing and connectivity testing and as the last step a connectathon between different Member States takes place.

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