What is the difference between common variation (also known as a natural variation) and assignable variation (also known as a special variation).
A common variation is also known as natural variation fluctuation, which is due to some unknown factors resulting in a steady but random distribution of output around the average of the data. The common variation is the measure of the process potential.
Examples of common variations
An assignable variation is also known as special variation. which is due to the distribution of non-random results caused by a single identifiable factor with clearly defined characteristics. Such a circumstance is imminently manageable.
Relating to project management is if machine malfunctions, computer crashes, there is a power cut, etc. These type of random things that can happen during a project are examples of special cause variation.
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