Practice Quiz

Six Sigma Green Belt

Category - Black Belt

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A Black Belt practitioner is commissioned to examine the reason adjustments to common cause variations are not leading to a reduction in variation. She finds that common cause variations are treated as special variations which is also called:
  1. norming
  2. deviation
  3. slacking
  4. tampering
Explanation
Answer: D - Tampering occurs when common cause variations are treated as special variations.

Key Takeaway: Common cause variations in process efficiency such as those attributed to machines and people skills should not be treated as special (unusual variations) as this results in tampering with the processes. Tampering does not lead to a reduction in variation and may cause them to increase. To avoid tampering, quality control charts should be used.
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