IASSC Certified Lean Six Sigma Green Belt (ICGB) — Question 22

Which statement(s) describe an undesirable situation when implementing SPC?

Answer options

• A. The lower Control Limit for the R chart is equal to zero
• B. Attempt to use SPC for tracking transaction times at a warehouse
• C. A process is in Statistical Control before implementation of SPC
• D. The Control Limits are wider than the customer specification limits

Correct answer: D

Explanation

Option D is correct because having Control Limits that are wider than customer specification limits indicates a lack of process capability and could lead to non-compliance with customer requirements. Options A, B, and C highlight issues, but they do not represent the critical negative impact on quality control that option D does.