CLL Quality Assurance & Improvement 3

Question 1

In a control chart, a 'run of eight' consecutive points on one side of the centerline indicates:

Accepted Answer

A potential special cause that should be investigated

Answer

A run of eight or more consecutive points on the same side of the centerline is a non-random pattern suggesting a special cause of variation.

Question 2

Which lean quality improvement approach focuses on reducing variation using statistical methods and follows a data-driven Define-Measure-Analyze-Improve-Control methodology?

Accepted Answer

Six Sigma

Answer

Six Sigma uses the DMAIC methodology and statistical tools to reduce process variation and defects to 3.4 per million opportunities.

Question 3

During a kaizen event focused on quality, the team discovers a step where operators frequently skip a check due to time pressure. The best lean response is to:

Accepted Answer

Implement a poka-yoke that makes skipping the check impossible

Answer

Poka-yoke (mistake-proofing) physically or mechanically prevents errors from occurring, making it impossible to skip a critical quality step.

Question 4

What is the primary purpose of a Measurement System Analysis (MSA)?

Accepted Answer

To assess whether the measurement system itself is capable of accurately detecting process variation

Answer

MSA evaluates the accuracy, repeatability, reproducibility, and stability of measurement systems to ensure the data being used for decisions is reliable.

Question 5

A process with a Cpk of 1.0 means:

Accepted Answer

The process mean is at one of the specification limits

Answer

A Cpk of 1.0 means the process mean is exactly three sigma away from the nearest specification limit, indicating the process is marginally capable but not centered.

(CLL) Certified Lean Leader Practice Test

(CLL) Certified Lean Leader Practice Test

CLL Quality Assurance & Improvement 3