… Model builders seem to assume implicitly that passing on knowledge, which was acquired through scientific research, is sufficient to convince people to change organizational policies. Studies on the impact of computer models on policy making have convincingly revealed two things. First, in most cases the impact is conceptual (i.e., people learn from it), rather than instrumental. Second, most of the learning takes place in the process of building the model, rather than after the model is finished.


first paragraph of this Foreword twelve years ago.

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