Assignable variation a distribution of non-random results caused by a single identifiable factor with clearly defined characteristics such a circumstance is imminently manageable in statistical process control, this is sometimes known as a special cause or exceptional variation.
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Though theoritically many trainers can answer this situation, this article will let you know how to deal with special causes of variation or assignable causes. Briefly, common causes, also called natural patterns, are the usual, historical, quantifiable variation in a system, while special causes are unusual, not previously observed, non-quantifiable variation.
Common & special cause variation : in statistical process control, the variation cause variation or special (assignable. Definition of assignable cause: alternative term for common cause.
An assignable cause exists when variation within a process can be attributed to a particular cause that is a fundamental part of the process once identified, the assignable cause of the errors must be investigated and the process adjusted before other possible causes of variation are examined.