Special Cause Variation in statistical measurement is the unusual, not previously observed, non-quantifiable variation in a system that is caused by unknown factors resulting in a non-random distribution of output. The Special Cause Variation is a specific change in a process resulting in a chaotic problem related to some defect in the system or method. The Special Cause Variation is also called as exceptional or assignable variation. (Refer to the Common Cause Variation)
Related Definitions in the Project: The Project Management
