This page is a memorandum of my idea.
The knowledge of this page was not put in Quality Engineering of this site.
The approach of quality engineering is useful. But in many papers, there are invalid explanations.
I try to re-construct quality engineering because this study field is confused.
I wrote, in the Process Control page , that the idea of "evaluation of the cost in the process" is same to social cost that Environmental Economics studies.
Quality engineering may be the study of " Quality for Environment " in the future.
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