Within our transdisciplinary research project (www.transens.de), we work jointly with 14 citizens (citizen working group or CWG) who are interested in the topic without being activists or having a specific agenda. The CWG helps us to enrich the research process with experiential knowledge. Parallel to gaining scientific knowledge, trust can be built due to close collaboration.

In the first part, we highlight the twofold responsibility concerning the current generation’s decision-making perspective for present and future generations. According to our survey data and a debate with citizens, we see the need to discuss the respective weighing of directly affected generations during the next few decades (until the repository’s closure, which affects about four to five generations) compared to justice for (five +) future generations in the following decades and centuries.

On the proposed poster, we report the results of an experimental study (N = 177) that investigated the preferences for and trust in different visualizations of simulation results and tested different modes of communication (verbal, numerical, and visual/graphical). The oral presentation will focus on another challenge of uncertainty communication, namely unquantifiable model uncertainties. In a repository, these may arise from the heterogeneity of the host rock.