11 - 12 June 2025 | Brussels, Belgium
ProjectathonOnce-Only Technical System Projectathon #6
A marathon of peer-to-peer interoperability and compliance tests in a structured environment
Practical information
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Location
Conference Center Albert Borschette (CCAB)
Rue Froissart 36
1040 Brussels, Belgium -
Date
11 - 12 June 2025. In addition, 10 June is foreseen as a preparatory “Day 0” to test the setup or perform readiness checks and 13 June as a travel day.
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Registration
15 April to 6 May
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Target groups
All Member State teams relevant for implementing the Once-Only Technical System as well as representatives from national competent authorities.
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Fees
No fees are charged to participate in this event.
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Travel
The Commission can cover the reimbursement of travel costs of up to four participants in total per Member State: up to two from the national team and up to two competent authorities representatives, vouched by their respective national coordinator.
Description
What is this event about?
This is a large-scale testing event that allows different Member State systems to connect under one roof and perform a marathon of peer-to-peer interoperability and compliance tests in a structured environment. In parallel to testing, two exploration tracks (workshops) will allow competent authorities and implementation teams to explore specific topics related to the Once-Only Technical System.
This Projectathon will be of thematic nature, to enable evidence exchange between national competent authorities in specific domains. It will focus on population, education and business data. In addition, this Projectathon will foster the on-going collaboration with related systems.
When will this event take place?
It will take place from 11 to 12 June 2025. In addition to these days, the participants are invited to join an optional “Day 0” on 10 June to prepare their setup and receive support from the Commission. As the testing activities during this Projectathon are condensed to two full days, the participants are strongly encouraged to stay until 17:00 on Day 2 (12 June) and travel home later in the evening of that day or on 13 June.
Who is this event for?
This Projectathon is open to all Member State teams, regardless of the maturity of their Once-Only implementation. The Commission also highly encourages competent authorities to attend.
What are the benefits of joining this event?
This Projectathon will allow national implementation teams to perform peer-to-peer and compliance tests over two days. The Commission will provide support to Member States that are (nearly) production-ready to enable end-to-end transactions, while assisting those catching up to enhance their technical readiness. In addition, national teams will be able to participate in ‘exploration tracks’, i.e. workshops focusing on specific topics related to the OOTS. This event will also allow participants to discuss more advanced scenarios in dedicated exploration sessions or in a restricted test session between teams interested in such scenarios.
In addition, competent authorities can benefit from joining the exploration tracks. These workshops will, for example, delve into telling compelling narratives around Once-Only, discuss the Once-Only Evidence Explorer and Common Services, and explore next steps towards exchanging structured data. These workshops will also be a unique chance for competent authorities to meet and connect with experts from all over Europe. In addition, competent authorities will have the chance to participate in or observe the end-to-end transactions of production-ready Member States.
How can you participate?
You can register for this event through EU Survey from 15 April to 6 May.
How to access the test cases
A high-level overview and summary of current test cases is available to the Testing and deployment sub-group (restricted access)(opens in a new tab).
The full test cases with detailed step-by-step descriptions will be made accessible later via the Gazelle platform (restricted access)(opens in a new tab).
Projectathon agenda
Exploration rooms
During this Projectathon, two exploration room tracks will run in parallel. Participants can join session from both tracks.
Perform Peer-to-Peer tests
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Search potential Test Partner through Gazelle
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Meet Test Partner and schedule test
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Execute Tests and upload evidence in Gazelle
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Monitors examine evidence and evaluate test result
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Fix bugs (if any)
How to register for the June 2025 Once-Only Technical System Projectathon
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1
Information: Attend the OOTS Implementers’ Café #14 on 15 April 2025.
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2
Registration: The registration period runs from 15 April to 6 May 2025.
Fill-in the event registration form (via EU survey) and accept to have read and understood the content of the Projectathon Playbook and Privacy Statement. It is mandatory for every participant of a Member State to fill in the event registration form (it is a pre-condition for getting access to the Gazelle platform). Participants and observers must register for each individual Projectathon. Please register on time, this is also needed for the catering. -
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The OOTS Support Team will send a confirmation email to you once your registration to the Projectathon is accepted. We will get in contact with you as from 22 April 2025 with more information about how to register and create your SUT in the Gazelle platform. Since 2024, Gazelle data has been anonymised, you will have to register again in 2025 and create your SUT according to the new modelisation.
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4
Register the system and participants in Gazelle: In case you need test related data for archiving or auditing purposes, don’t forget to archive your data in Gazelle at the end of the year since data will be again anonymised and will be deleted one month after the end of the year (around end of January 2026).
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5
If not already done, register to the Microsoft Teams Implementers Space(opens in a new tab) via the Service Desk(opens in a new tab). This Teams channel is made available for everyone that registers and participates to the Projectathon to facilitate knowledge-sharing and closer collaboration.
Projectathon timeline
April
Information
15 April 2025Attend the Projectathon Deep-Dive session during the OOTS Implementers Café on that day.
Signal your intention to participate in the June 2025 Projectathon as Members States (can be with multiple teams).
Implementers Café #14
Projectathon preparation and Lithuanian event debrief.
April - May
Registration
15 April - 6 May 2025Register to the June 2025 OOTS Projectathon via EU Survey.
Register your organization and SUT operator(s) in Gazelle.
From 22 April: Register your system under test (SUT) and features to be tested in Gazelle.
May - June
Pre-Projectathon test
13 May - 6 June 2025Projectathon Kick-off session with all participants.
Online event on 13 May 2025.
14 May - 6 June 2025
Perform Preparatory Test to get your system, test data and yourself ready before the Projectathon.
26 May - 6 June 2025
Perform Connectivity Test to ensure network connection of SUTs are well configured before the Projectathon.
June
Projectathon
11 - 12 June 2025Game on!
Connect and perform Peer-to-Peer marathon test!
Optional Day 0 - 10 June 2025
Opportunity to get dedicated setup/support or perform readiness checks for OOTS components.
June
Post-Projectathon
End June 2025Publication of Test Reports, lessons learned and best practices.
Implementers Café #15
"Projectathon debrief (June 2025 event) and next steps" 24/06/2025.
Projectathon PlaybookWant to learn more?
Explore the Projectathon Playbook for a detailed overview of the Projectathon events organisation, teams and how to participate.