Terje Aven is Professor of Risk Analysis and Management at University of Stavanger, Norway. He is also a Principal Researcher at Rogaland Research, Norway. His professional career includes experience in the petroleum industry (Statoil) in addition to his time in research and education. His research interests include decision support tools, risk management, risk acceptance, reliability and risk analysis methods, and risk assessments reflecting human and organizational factors. He is a member of the Norwegian Academy of Technological Sciences. He has been awarded several prizes for his research and teaching activities. Jan Erik Vinnem is Professor II of Risk Analysis at University of Stavanger, Norway. He is also a specialist advisor and CEO of Preventor AS, a consultancy to the Norwegian offshore industry. His professional career includes experience in the petroleum industry (Statoil and Total), and work as a private consultant (as the founder of Safetec Nordic AS and Preventor AS), in addition to his time in research and education. His research interests include decision support tools, risk management, risk acceptance, risk analysis methods, and risk assessments reflecting human and organizational factors.