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Qualitative Model into Casual Dependency Graph
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To infer causal relationships, Simon and Iwasaki's
causal ordering procedure is used
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# Equations = # quantities
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Equations must be independent
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Equations must represent a conceptually distinct
mechanism
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For quantities controlled externally, an equation
quantity = constant must be supplied
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Find minimal complete subset :
set of n equations with n quantities that does
not include a subset of such equations
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Remove these equations and their quantities from the list
of equations
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Repeat until set of equations cannot be reduced further
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For each equation in the original set, the quantity
that was reduced last is causally dependent upon
all the other quantities in the equation.
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From this a directed graph can be constructed
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