In May 2022, the Forum on Stakeholder Confidence (FSC) and the Integration Group for the Safety Case (IGSC) held a Joint Workshop with stakeholders from Germany, Sweden and Switzerland to assess the challenges in communicating scientific safety evidence to non-technical stakeholders and to find ways to effectively communicate such knowledge to increase confidence in the safety case. The workshop also provided an opportunity to learn from local stakeholders in Switzerland and abroad about fostering confidence among non-technical audiences and creating engagement in the waste repository development process. This summary report presents the results and general findings of the workshop.