Management Is Prediction --Dickeson

Lay Down the Law

We know that routine variation is a law of economic life. Ninety-nine percent of the ups and downs are "chance" variations. Unless we substantially change the process there's a very high probability that deflections will be no greater than X and no worse than Y. Our predictive reliability is somewhere between X and Y. That's the best we can do. Look at the past and accept its variances as the measure of what's "normal."