Abstract
Although much has been written about validating Decision support systems andother ‘hard’ OR models, less has been written about validating‘soft’ OR models. This article seeks to determine which contingencyfactors known to influence DSS validation are also important factors influencingproblem structuring methods (PSM) validation. In addition, after consultationwith PSM experts other contingency factors influencing PSM validation areproposed. Evidence from these PSM experts concerning the levels of influence ofthese factors is used to support proposals for a contingency approach to PSMvalidation.
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