方法：制订动态指标的参考值，利用控制图完成对指标的控制。
Method: Setting up the reference value of the dynamic index, control index by controlling graph.
利用控制图对工序进行了有效的现场控制并在实践中取得了明显的改进。
An effective spot-control method with control chart has been made in productive process, and obvious improvements are obtained in practice.
经济合理地利用控制图进行成组生产工序质量相对控制，必须先设计出经济控制图，并经济地运用控制图。
In order to use the control chart to control the process quality economically and reasonably, the most important task is to design an economical control chart and to make use of it economically.
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