Lean Six Sigma Green Belt Certification Improve Phase and Solutions 2

Question 1

In a Design of Experiments (DOE), what is the purpose of a 'center point'?

Accepted Answer

To detect curvature in the response surface

Answer

Center points are added to a factorial design to detect nonlinear (curved) relationships between factors and the response.

Question 2

A project team wants to pilot a solution before full deployment. Which tool best structures the pilot plan?

Accepted Answer

Pilot plan with PDCA cycle

Answer

A pilot plan using the PDCA (Plan-Do-Check-Act) cycle structures the test, measurement, and review of a solution before full rollout.

Question 3

What does 'mistake-proofing' (poka-yoke) primarily target in a process?

Accepted Answer

Preventing defects by making errors impossible or immediately detectable

Answer

Poka-yoke devices are designed to prevent errors from occurring or to detect them immediately if they do occur.

Question 4

Which type of waste in Lean is represented by excess inventory beyond what is immediately needed?

Accepted Answer

Inventory

Answer

Inventory waste refers to excess materials, WIP, or finished goods that occupy space and tie up capital without adding value.

Question 5

A team implements a solution and measures a 40% reduction in defects. What is the NEXT step in the Improve phase?

Accepted Answer

Verify the improvement is statistically significant and sustainable

Answer

After measuring improvement, the team must verify statistical significance and sustainability before declaring success or expanding.

Lean Six Sigma Green Belt Certification Practice Test