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  •  The process's critical and significant characteristics have been defined.
  • A means for continuously monitoring those characteristics has been established.
  • Those sources of process variances that affect these characteristics are known and are capable of being affected (controlled/reduced/elliminated)
  • From the monitored output, the characteristic's mean and standard deviation have been calculated and control limits have been established.
  • From subsequent monitoring of the process's characteristics output, a linear relationship between emerging patterns and process variance can be established.
  • Once such a pattern has been recognized, process adjustments which affect these variances are made.
  • If subsequent monitoring of the characterictic's output reveals that the monitored pattern has been reduced or eliminated, then it can be assumed that the related variance has been reduced or elliminated.
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