Control chart(英文版)(ppt 52页)

Control chart（英文版）内容提要：
How to Set-up a Control Chart?
1、Validate the computed control limits against data collected by re-plotting the control chart with data & new control limits
  - Do the limits detect known problems?
  - Are the limits too sensitive?  Would they flag problems you do not know how to react to?
2、Use the control limits established to monitor the critical parameter identified
3、For each & every identified critical parameters, every machine should have a separate control chart with separately computed control limits

..............................