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What is the difference between common variation (also known as a natural variation) and assignable variation...

What is the difference between common variation (also known as a natural variation) and assignable variation (also known as a special variation).

Business   Operations-Management   
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Answer #1

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

  • poor working conditions,
  • measurement errors,
  • normal wear and tear,
  • computer response times

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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