Qualitative and quantitative modelling in system dynamics: some research questions

By G. Coyle. 2000

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Collecting and analyzing qualitative data for system dynamics: methods and models (2003, background): “In some cases, the uncertainty associated with the quantification of qualitative variables has caused experts to believe that the results from ensuing simulations could be misleading , or at least, very fragile (Coyle 2000).”
Group model building effectiveness: a review of assessment studies † (2002, background): “Several authors feel that the choice for qualitative versus quantitative models depends on problem characteristics such as scope, tangibility, data availability and conflict between stakeholders (Akkermans 1995; Coyle 2000).”
Selecting among five common modelling approaches for integrated environmental assessment and management (2013, background): “Each parameter needs to have a real world counterpart (Sterman, 2000), and should be tested for the values for which the model remains valid (Coyle, 2000).”