Uncertainty and values: The case of environmental impact assessment

The increasing complexity of policy issues, as well as the centering of environmental issues in the policy arena, has led to an increased dependence on science in public policy. This has, in turn, led to increased attention to, among other things, the science-policy relationship and the way in which scientific uncertainty is treated in the public sphere. This article examines both problems in the field of environmental impact assessment (EIA). Our study reveals that, apart from the epistemic uncertainty concerned with the predictive capability of scientific theories, EIA brings additional components of uncertainty and challenges for the policymaker. We further confirm recent findings with respect to the inadequacy of the traditional rational model to account for extant science-policy relationships. The article also posits an alternative model that allows one to unpack the processual components of the science-policy relationship.