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Chapter 10. Measuring Quality > Monitoring Through Statistical Process Control

Monitoring Through Statistical Process Control

The idea behind statistical process control (SPC) is that over a period of time you can take measurements on a process and determine whether that process is going out of control. Examples of process measurements include

  • Number of defective units in a manufacturing run

  • Average number of defects in a unit

  • Average diameter of a part that must meet a precise specification

  • Average number of errors in an invoice

  • Average length of time that customers remain on hold

  • Average available capacity of a data communications circuit


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