This paper deals with the kind of reasoning which is involved in diagnosis and analysis of disease causes. Mackie's theory of singular causality is shown to be a fruitful tool for this kind of analysis. We expand this theory and discuss some issues about the nature of causal complexes (their prototypical character) and about how detailed a causul tree structure must be (the stop problem). It is argued that causal and diagnostic reasoning is driven by mental model constructions.
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Maybe that would be the only way of explaining the nature of causal reasoning; but we don't want to discuss that here.
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