"Given my present belief in the much greater range of variability as to both order and kind of complexity in the world's musics versus the world's languages, I can hardly imagine how a model developed really satisfactorily for the detailed structureal explanation of one musical language is so easiy modified to another, and all the more so if the original model be evolved from linguistics rather than from the musical disciplines."
Based upon evidence such as already presented, it appears feasible to set up criteria by which to determine when assignable causes of variation in quality have been eliminated so that the product may then be considered to be controlled within limits. This state of control appears to be, in general, a kind of limit to which we may expect to go economically in finding and removing causes of variability without changing a major portion of the manufacturing process as, for example, would be involved in the substitution of new materials or designs.walter a. shewhart
When plugged in, the least elaborate computer can be relied on to work to the fullest extent of its capacity. The greatest mind cannot be relied on for the simplest thing; its variability is its superiority.jacques barzun
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