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Six Sigma Green Belt Exam Prep

Category - Six Sigma Green Belt

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Workers in the overnight shift at an assembly line, on average, require 8.5 minutes to complete once production cycle. Production managers have contributed this to biological differences in overnight reaction times. What type of variation is this an example of:
  1. wear-and-tear
  2. inherent
  3. special cause
  4. deliberate
Explanation
Answer: B - Inherent variation is process variation that exists naturally.
Key Takeaway: Process variations that exist naturally include nocturnal differences in human performance. If workers in the overnight shift consistently require a longer period of time to complete one production cycle, regardless of skills, staffing and machine performance, then this is considered to be inherent variation.
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