Communication  has  a  specific  role  to  play  in  the  development  of  deep  geological  repositories.  Building trust  with  the  stakeholders  involved  in  this  process,  particularly  within  the  local  community,  is  key  for effective communication between the authorities and the public. There are also clear benefits to having technical experts hone their communication skills and having communication experts integrated into the development process. This report has compiled lessons from both failures and successes in communicating technical information to non-technical audiences. It addresses two key questions in particular: what is the experience base concerning the effectiveness or non-effectiveness of different tools for communicating safety case results to a non-technical audience and how can communication based on this experience be improved and included into a safety case development effort from the beginning?