Progress in modifying our concept of control has been and will be comparatively slow. In the first place, it requires the application of certain modern physical concepts; and in the second place it requires the application of statistical methods which up to the present time have been for the most part left undisturbed in the journal in which they appeared.

Shewhart, Walter A. (1931). Economic control of quality of manufactured product. D. Van Nostrand Company. p. 4-5.