of complex systems.  The engineering
of this software could extend work already begun in simulation
modeling (Widman, Loparo, &amp; Nielsen, 1989), (Yip, 1991), nonlinear
dynamics and chaos (Rietman, 1989), (Tufillaro, Abbott, &amp; Reilly, 1992),
and expert systems (Bratko, Mozetic, &amp; Lavrac, 1989), with increasing
capabilities for qualitative inference about complex systems and for
intelligent navigation of dynamic manifolds (Weld &amp; de Kleer, 1990).

Jon Awbrey

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