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<p>Functional reasoning, a subfield of model-based reasoning, is discussed. This approach uses abstractions of a device's purpose to index behaviors that achieve that purpose. Functional modeling, a variation on this method, also uses simulation as a core reasoning strategy. The complex causal knowledge of a device along functional lines is decomposed, then a causal story of how the device will operate in a particular situation given stated boundary conditions is composed. The application of the functional approach to modeling the fuel system of a F/A-18 aircraft is described. The representation of the F/A-18 fuel system includes 89 component devices, 92 functions, 118 behaviors, and 181 state variables.</p>

J. Sticklen, W. Bond and M. Pegah, "Functional Representation and Reasoning About the F/A-18 Aircraft Fuel System," in IEEE Intelligent Systems, vol. 8, no. , pp. 65-71, 1993.
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