The second Once-Only Technical System Projectathon – more scenarios, more testing and more progress

16 June 2023 | 4 minutes read

On 14-16 June 2023, the second Once-Only Technical System Projectathon brought together all 27 EU Member States for a marathon of peer-to-peer interoperability testing. This was the second of three such events planned to take place in 2023. Projectathons facilitate crucial development, testing and eventual deployment of national Once-Only Technical System implementations.

Neutral experts, acting as monitors, supervised and verified the tests carried out over the three days. The Once-Only Technical System Projectathons are not pass/fail type examinations. Rather, they are a collaborative exercise in understanding technical and operational issues and working together to solve them.

The June Projectathon was an excellent opportunity for national implementers to learn, help each other and to assess their current state of play regarding their Once-Only Technical System developments. In addition to testing, Member States experts collaborated on improving the Once-Only Technical System user-experience, learned about lifecycle management updates to the Once-Only Common Services, the use of eIDAS eID in realising this System, related systems and defining operational arrangements for the Once-Only domain.

The Commission will publish an event report for the June Projectathon shortly. In the meantime, you can consult the April Once-Only Technical Projectathon event report, summarising key results from the testing that cook place from 19-21 April 2023.

On the final day of this Projectathon, the ‘OOTS & EU DI Wallet Synergies and Interoperability Contact Group’ met to discuss the topic of power and mandates and data sharing in the context of cross-border identification using the European framework for digital identity (known as eIDAS).

To learn more about how the Once-Only Technical System will contribute to Europe’s Single Market, visit the Once-Only Hub.

Participant insights

Get an insider's perspective on the event from participant insights.

“The value of this event is immeasurable. I already saw this value at the last Projectathon […] and it was a very difficult road to nationally make the office management aware of hiring a team for this Projectathon. But after we managed to come to the #2 Projectathon in larger numbers and successfully completed most of the tests, the transfer of information […] will be much easier to integrate into the management and I believe that we have opened new national perspectives"

“Thank you for organising such a wonderful event! We were very happy to participate again and learned a lot. Heading home with lots of homework... :)"

“Paving the road for the European Interoperability! Another successful projectathon of the technical system for the cross-border data exchange. The Once Only Technical System (OOTS) will connect public authorities across the EU, so they can exchange official documents and data at the citizen's request. Great team Portugal!!!”