KJELL ANDERSSON, PhD in theoretical physics, was among the first to understand the need for dialogue and transparency in the Swedish nuclear waste management programme. He has since then been the leader of many projects dealing with public participation and risk communication in energy production, mobile telephone systems and environmental protection. Andersson has recently proposed the establishment of a 'European Transparency Arena' aimed to support political decision-making in controversial issues. He is the Managing Director of Karita Research, where he develops methods to strengthen political and public awareness in areas with a high scientific and technological content.