The CERTAINTY Project Kickoff Meeting took place from February 27th to February 29th, 2024, at Maison Irène et Frédéric Joliot-Curie in Brussels, Belgium. The meeting aimed to initiate discussions and collaborations among project partners. Throughout the meeting, participants engaged in insightful discussions, exchanged ideas, and outlined plans for project implementation. The agenda included presentations from key stakeholders, discussions on policy context, and detailed talks on various work packages and project aspects. Additionally, social events such as dinners facilitated networking and collaboration among attendees.