Lean Six Sigma Green Belt Control Phase and Sustainment Questions and Answers

Question 1

What is the primary purpose of the Control Phase in a DMAIC project?

Accepted Answer

To lock in the gains and ensure the improved process is sustained.

Answer

The primary purpose of the Control Phase is to ensure that the improvements made in the 'Improve' phase are maintained over the long term. This involves creating monitoring systems, standardizing the new process, and transferring ownership.

Question 2

A project team implemented a new stocking procedure to reduce order fulfillment time. To monitor the new process and ensure it remains stable, they track the average fulfillment time daily. Which tool is most appropriate for this task?

Accepted Answer

Statistical Process Control (SPC) Chart

Answer

Statistical Process Control (SPC) charts are specifically designed to monitor process performance over time, distinguish between common cause and special cause variation, and detect when a process is becoming unstable.

Question 3

Which of the following is the MOST critical component of a comprehensive Control Plan?

Accepted Answer

A response plan for out-of-control conditions.

Answer

While a Control Plan documents what to monitor and how, its most critical element is the response or reaction plan. This plan details the specific actions to be taken by responsible personnel when the process shows signs of being out of control, ensuring that deviations are addressed promptly before they become major problems.

Question 4

A Green Belt project to reduce invoicing errors has successfully concluded, and the improved process is stable. What is the final, crucial step to ensure long-term sustainment of the gains?

Accepted Answer

Formally transferring ownership to the process owner with a documented control plan.

Answer

Long-term sustainment depends on clear accountability. The project team must formally hand off the improved process to the process owner, who is responsible for its day-to-day management. This transfer includes providing all necessary documentation, especially the control plan, to enable the owner to monitor and maintain the process effectively.

Question 5

A manufacturing team has implemented a new assembly sequence that is more ergonomic and efficient. To ensure all operators, including new hires, perform the task consistently according to the improved method, what document should be created or updated?

Accepted Answer

Standard Operating Procedures (SOPs)

Answer

Standard Operating Procedures (SOPs) provide detailed, step-by-step instructions for performing a task. Updating or creating SOPs is a fundamental activity in the Control phase to ensure the new, improved method is standardized and consistently followed by everyone.

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Certification Practice Test

Lean Six Sigma Green Belt Control Phase and Sustainment Questions and Answers