Models for policy-making in sustainable development. The state of the art and perspectives for research

More and more frequently policy-makers are urged to assess the impact of their strategies and policies in terms of sustainable development. This necessitates the use of applied scientific models as tools for identifying and evaluating the likely environmental, economic and social impacts of alternative policies. The objective of this paper is to provide a framework to help decision-makers choose the most appropriate-or the most appropriate mix-of models, by assessing their relative strengths and weaknesses. The paper also allows potential improvements in modeling techniques to be identified. Six modeling paradigms are assessed, both on a general basis and with respect to two specific policy contexts (energy policy, and land use and transport planning)