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Controlled Variation

Variation that DOES appear to have a steady and uniform pattern of variation during a certain period of time. Controlled Variation maybe random at times throughout it’s life. It is believed to be inherent to the design, process, or procedure. This type of variation is considered satisfactory or expected.

Controlled Variation is sometimes referred to as common cause, (Opposed to  special cause).

Uncontrolled Variation

Variation that appears DOES NOT to have any steady or uniform pattern of variation during a certain period of time, and thus is considered unpredictable.

Uncontrolled Variation maybe referred to as special cause, (Opposed to  common cause).



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Last Updated: Saturday, 10-Jun-06 15:50:57 PDT