Abnormal outcome variation can be attributed to Assignable causes in input or environmental variables.
What are assignable causes?
An identifiable cause is an occasional, unpredictable source of variation. It is occasionally referred to as a "special cause" variation. An assignable cause is indicated on a control chart by points outside the control limits or by non-random patterns inside the control limits. A process flaw, mistake, delay, breakdown, accident, and/or shortage can all be considered assignable causes of variance. An activity or occurrence that may be connected to a system's inconsistency is known as an assignable cause. It has been determined that this is a unique cause. As a reminder, common cause variation is the system's normal fluctuation. It results from the world's innate randomness.
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