Walter A. Shewhart Quotes
March 18, 1891 – March 11, 1967
More Walter A. Shewhart Quotes
In other words, the fact that the criterion we happen to use has a fine ancestry of highbrow statistical theorems does not justify its use. Such justification must come from empirical evidence that it works.
Walter A. Shewhart— Shewhart, Walter A. (1931). Economic control of quality of manufactured product. D. Van Nostrand Company. p. 18.
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— Shewhart, Walter A. (1931). Economic control of quality of manufactured product. D. Van Nostrand Company. p. 24.
Every sentence in order to have definite scientific meaning must be practically or at least theoretically verifiable as either true or false upon the basis of experimental measurements either practically or theoretically obtainable by carrying out a definite and previously specified operation in the future. The meaning of such a sentence is the method of its verification.
Walter A. Shewhart— Shewhart, Walter A.; Deming, William E. (1939). Statistical Method from the Viewpoint of Quality Control. The Graduate School, The Department of Agriculture. p. 94.
Both pure and applied science have gradually pushed further and further the requirements for accuracy and precision. However, applied science, particularly in the mass production of interchangeable parts, is even more exacting than pure science in certain matters of accuracy and precision.
Walter A. Shewhart— Shewhart, Walter A.; Deming, William E. (1939). Statistical Method from the Viewpoint of Quality Control. The Graduate School, The Department of Agriculture. p. 120.
