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Computer technology has yet to provide the modeling enterprise with adequate tools, with the results that modeling has become confused with simulation; modelers are artificially constrained to state-transition models; modelers cannot adequately deal with complex models; modelers often obtain numbers but not insight; and quantitative and qualitative models cannot be gracefully combined. Research that might alleviate these problems is discussed in this Note. A language must be developed that can smoothly express quantitative and qualitative notions in the context of a stand-alone model. The authors describe one small step in this direction: They model a little girl bouncing a ball, which involves both physical constraints and human decisionmaking, in a tightly intertwined manner. They also developed an illustrative language for expressing the model. This exercise demonstrated the importance of a stand-alone model and of the ability to smoothly combine qualitative and quantitative model elements. The need for improvement in automatic deduction is also discussed.

This report is part of the RAND Corporation note series. The note was a product of the RAND Corporation from 1979 to 1993 that reported other outputs of sponsored research for general distribution.

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