Steve R, Reading the following in a psych. group, made me think of your diagnostic program - the real world is generally messy: The principle applies to all AGI programs. "there is of course an interesting phenomenon in medicine generally where theories of causality may swing with the development of new data - consider things like stomach ulcers, generally seen as a purely medical problem until theories of stress (and especially Brady's work) had us all believing this was the key. Then we had helicobacter come onto the scene, and everything became medical again - until we discovered that we still had to explain why many people had helicobacter but no sign of ulcers..... Is often *far* from easy to identify causes or even to specify "one" cause."
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