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Scale choices influence the content of a study (the problems on the agenda, the options found and the impacts addressed) and the process (actors involved, their dedication and criticalness). This work synthesizes different perspectives on scale choices (spatial boundary setting and temporal boundary setting) in policy analysis.

Uncertainties caused by soil heterogeneity play an important role in the characterisation of contaminant transport through ground water. In this paper a process-based approach is presented as a method to generate predictions of the contaminant migration while taking these uncertainties into account throughout the entire process. The process-based approach is part of the concept of Flexible Emission Control (FEC). The concept of Flexible Emission Control consists of a dynamic approach of dealing with soil contamination problems. Based upon the understanding of the subsoil together with the character of the pollution, site investigation remedial me