Broadly speaking, the object of industry is to set up economic ways and means of satisfying human wants and in so doing to reduce everything possible… - Walter A. Shewhart

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.

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.

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.