The main objective of the plenary was to evaluate the progress of ongoing Work Packages, coordinate upcoming tasks, and foster strong collaboration across partners.

The event featured an intensive agenda with strategic workshops, technical deep-dives, and interactive sessions designed to strengthen the MATISSE framework for model-based engineering of trusted Digital Twins.

Day 1: Hackathon – Hands-on Innovation

The meeting opened with the first MATISSE Hackathon, a dynamic co-creation event that brought together use case providers and solution developers. Teams were challenged to collaboratively prototype architectural solutions to nine real-world challenges.

Three teams were awarded prizes after voting based on innovation, feasibility, and potential impact. The day concluded with a joint dinner where participants celebrated the Hackathon winners in a relaxed, social setting.

Day 2: First Open Door Event and Technical Workshops

The second day welcomed over 20 external stakeholders for the First MATISSE Open Door Event—a dedicated morning for knowledge exchange and networking.

Highlights included:

• An educational workshop led by Alessio Bucaioni (MDU) and Luca Berardinelli (JKU), introducing key concepts in Digital Twin Engineering and Model-Driven Engineering (MDE).
• A presentation of the D2.1 Deliverable by Luca Berardinelli and Hugo Bruneliere (IMT Atlantique), unveiling foundational insights on traceability, fidelity, and federation in Digital Twin systems.
• An interactive feedback session, where external and internal participants shared their insights to guide the next steps of our research and publications.

In the afternoon, partners participated in a kick-off workshop for upcoming deliverables D1.2 and D2.2 (MATISSE Architecture), followed by a workshop on partner's exploitation plans led by Alexandra Espinosa Hortelano (MDU) and Gabriela Lucas (CleanWatts).

Day 3: Work Package Presentations and Forward Planning

The final day focused on strategic alignment and coordination:

• Presentations from WP3 and WP4 leaders on progress and next steps
• An overview of dissemination and exploitation activities
• Updates on administrative and management matters
• A forward-looking session planning the project’s next major milestones

The meeting concluded with renewed momentum and alignment, setting the stage for an ambitious and productive phase ahead.

The Rome plenary was not just a technical milestone—it was a celebration of collaboration, innovation, and shared purpose. With the first Hackathon and Open Door Event now behind us, the MATISSE community looks ahead with confidence to its next plenary meeting in September 2025, and to the ongoing journey toward trustworthy and interoperable Digital Twin solutions.