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Walter A. Shewhart

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Postulate 1. All chance systems of causes are not alike in the sense that they enable us to predict the future in terms of the past.

 
Walter A. Shewhart

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Prediction of the future is possible only in systems that have stable parameters like celestial mechanics. The only reason why prediction is so successful in celestial mechanics is that the evolution of the solar system has ground to a halt in what is essentially a dynamic equilibrium with stable parameters. Evolutionary systems, however, by their very nature have unstable parameters. They are disequilibrium systems and in such systems our power of prediction, though not zero, is very limited because of the unpredictability of the parameters themselves. If, of course, it were possible to predict the change in the parameters, then there would be other parameters which were unchanged, but the search for ultimately stable parameters in evolutionary systems is futile, for they probably do not exist... Social systems have Heisenberg principles all over the place, for we cannot predict the future without changing it.

 
Kenneth Boulding
 

Postulate 2. Constant systems of chance causes do exist in nature.

 
Walter A. Shewhart
 

People ask me to predict the future, when all I want to do is prevent it. Better yet, build it. Predicting the future is much too easy, anyway. You look at the people around you, the street you stand on, the visible air you breathe, and predict more of the same. To hell with more. I want better.

 
Ray Bradbury
 

Anyone who tries to predict the future is inevitably a fool. Present company included. A prophet without a sense of humor is just stupid.

 
David Brin
 

Dylan is free now to work on his own terms. It would be foolish to predict what he will do next. But hopefully he will remain a mediator, using the language of pop to transcend it. If the gap between past and present continues to widen, such mediation may be crucial. In a communications crisis, the true prophets are the translators.

 
Ellen Willis
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