Mundel, August B., P.E. (1989, ASQC) White Plains, NY
International trade can be carried on under only one condition -- a condition of mutual understanding. When product is ordered there must be complete understanding on how each item is to be measured, and what is acceptable and what is not acceptable. For some items it is impossible to measure or test an item without destroying it, and in other cases the cost of testing or measuring an item is uneconomic. There must therefore not only be agreement on what is to be measured and how it is to be measured, but also on how sampling is to be done and what sort of accuracy is to be expected.
Measurement and control