Widening the understanding of risk approaches by comparing definitions from different disciplines

The aim of this chapter is to critically reflect definitions of hazard, risk, and risk per-ception, and their assessments used in different scientific disciplines and give ex-amples of the potential implications for scientific discussions, knowledge manage-ment, and risk communication. Scientists with backgrounds in public health, psy-chology, environmental health, occupational health, engineering, sociology and medicine were asked for a definition of hazard, risk, risk assessment and risk per-ception seen from their specific scientific disciplines. Hazard is generally seen as an adverse event or condition. For most risk definitions, probability and severity are important aspects. Often a quantification of risk is desired, whereas risk perception is seen as a subjective appraisal and a cognitive construct. As risk perceptions are based on a combination of knowledge and individual values and affects, it may not provide a reliable guidance for risk management decisions on a societal level. Disci-pline differences are mainly connected to terminology and interpretation of key con-cepts but the differences are based on different tasks and perspectives. For dealing with controversies in science across disciplines, an acceptance and appreciation of terminology and perspectives from different scientific disciplines is needed to assure a transparent risk assessment process.