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"In Control" does not mean good

Statical Process Control (SPC) will only help address changes that drive a process "out of control". An "in control" process is unrelated to whether or not the units it produces are acceptable. This concept often leads to the misapplication of statistical process control. That said, when properly understood and applied, SPC can be a power tool for addressing process changes before they result in lost produce.

SPC is non-value added, it invested cost on man power is the biggest disadvantage. The advantage is SPC can give you high confidence level on the quality.

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Q: What are the disadvantages of using a statistical process control?
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