> The term "model" has, however, two senses—an "of" sense and a "for" sense—and though these are but aspects of the same basic concept they are very much worth distinguishing for analytic purposes. In the first, what is stressed is the manipulation of symbol structures so as to bring them, more or less closely, into parallel with the pre-established nonsymbolic system, as when we grasp how dams work by developing a theory of hydraulics or constructing a flow chart. The theory or chart models physical relationships in such a way—that is, by expressing their structure in synoptic form—as to render them apprehensible; it is a model of "reality." In the second, what is stressed is the manipulation of the nonsymbolic systems in terms of the relationships expressed in the symbolic, as when we construct a dam according to the specifications implied in an hydraulic theory or the conclusions drawn from a flow chart. Here, the theory is a model under whose guidance physical relationships are organized: it is a model for "reality."<span>Clifford Geertz, "The Interpretation of Cultures," p. 94</span>
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