Reductionism SHRDLU A program with input sensors where people can type in things and alter a virtual world At time, big achievement in A.I. Closed system Controlled all the variations, those assumptions see below BERMUDEZ ? SHRDLU at the interface uses natural language It outputs ?Take the green pyramid and put it next to the ball? Translates these ordinary English sentences to a machine languages Ordinary language predication are sometimes (often, mostly): Vague EX-asking for directions Saying 1 mile and meaning .9 or 1.1 mi. Context dependent Lack complete rules for their application Internal validity of a model The ability to make consistent, successful prediction within the context specified by the model Works within the closed model of the system External validity of a model The model can be successfully extended to situations (contexts) outside the original, closed system. EX-Gravity, you can?t shield it?it occurs everywhere Antibiotics, you can market it to people all over the world
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