Control chart or Shewhart control chart was introduced and developed by Walter A. Shewhart in the 1920s at the Bell Telephone Laboratories, and is likely the most “technically sophisticated” for quality management (Montgomery, 2009).
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Control charts is a special form of “run chart that it illustrates the amount and nature of variation in the process over time”.
Also, it can draw and describe what has been happening in the process.
Therefore, it is very important to apply control chart, because it can observe and monitor process to study process that is in “statistical control” which means No problem with quality
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