(1) Uncertainties in the physical setting; (2) Theoretical background; (3) General working approach; (4) Decision framework; (5) Applications and results; The thesis includes the following papers: (I) Norrman, R: Risk-based decisions analysis for the selection of remediation strategy at a landfill; (II) Norrman, J, Rosén, L, Norin, M: Decision analysis for storage for reclaimed asphalt; (III) Norrman, J, Rosén, L: On the worth of advanced modeling for strategic pollution prevention; (IV) Norrman, J, Starzec, P, Angerud, P, Lindgren, Å: Decision analysis for limiting leaching of metals from mine waste along a road; (V) Norrman, J: Influence diagrams as an alternative to decision trees for calculating the value of information at a contaminated site; (VI) Norrman, J: Decision model using an influence diagram for cost efficient remediation of a contaminated site in Sweden