As the quality problems are identified, the root causes of the problems are found and eliminated, the quality level is improved from to, and the corresponding preventive identification cost curve becomes flatter, and the total quality cost is lower. Under the action of continuous improvement action, this process will be repeated in the following stages, the quality level will gradually approach the perfect quality level, the preventive identification cost curve will gradually decline, and the corresponding total quality cost curve will also move down, and the prevention identification cost and total quality cost will continue to decline in the process of improving the quality level.<br>
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