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From the point of view of quality management in manufacturing, it is necessary to establish quality standards in a quantitative form. It is for this reason that experts have spent so much time trying to express these standards as far as possible in terms of quantifiable, measurable physical properties. This does not mean, however, that subjective assessments of quality are now relegated to the background. On the contrary, it is these assessments that are the subject of commercial interest.

Taking a broader view, we can see that at any given time there are very specific human desires that can be satisfied by transforming raw materials into finished products for various purposes. These desires are statistical in nature, as the quality of the final product, expressed in terms of physical characteristics, desired by one person may not coincide with the desires of all others.