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problem-types.html
Figure 1. Types of environmental problems and decisions (adapted from Cunningham & Saigo 2001).
alignment between costs and values  good poorsimple EASY 
regulationsCPR 
community rulescomplex INFORMATION 
more researchWICKED 
political processesThe application of the "precautionary principle" is an example of making a decision in a complex system with poor alignment of values, i.e. addressing a WICKED problem.
The question as posed by Hertwich et al 2000-
How do we move uncertain scientific information into the policy arena?
link to wicked-problems.html