Another way of emphasizing this diversity is to argue that if one cannot forecast (predict), one does not have a theory, and that forecasting is the … - C. West Churchman

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Another way of emphasizing this diversity is to argue that if one cannot forecast (predict), one does not have a theory, and that forecasting is the weakest link in the chain of the management sciences at present. Indeed, if one cannot predict one cannot measure, and if one cannot measure, then there is no "theory."