At one of management cycle, process of plan (plan), execution (do), appraisal (study) and improvement (act) is executed in order, last act is tied to following plan, the management technique which maintenance improvement and continuous business improvement activity etc. of quality are promoted in spiral condition.
From around the middle of the eighties, it is called the father of quality control W. Doctor Deming (Dr. William Edwards Deming)replacing toPDCA cycle, the word which it starts using. As for check having become study, you say that there is a nuance that it is appraised in detail.
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