In 2021, BASE headed a short workshop called “What do we need to do to trust in models?” at the first edition of the safeND symposium conference (safeND: "Safety of Nuclear Waste Diposal“; Kock et al. 2021). Because of the broad interest people showed in the topic, three consecutive workshops on the topic of “Trust in Models” (TiM) were held between 2022 and 2025.  In this Open Letter, we will present the main points of discussion.

Up to now, only little research has been done on the question of when a scenario is covered by calculation cases. The outcome of the EMS (Entwicklung einer Methode zur szenariengestützten Identifizierung von Berechnungsmodellen) project is intended to support the Federal Office for the Safety of Nuclear Waste Management (BASE) within the framework of supervision and approval in the evaluation process of whether scenarios have been sufficiently covered by calculation cases.