Six Sigma Green Belt Certification Practice Exam

A Six Sigma project has reduced the variability in a process. What should be done to facilitate further reductions in variability?

1. Develop a control plan

2. Perform a measurement system capability re-analysis

3. Hold a brainstorming session

4. Perform a failure modes and effects analysis

The correct answer is: Perform a measurement system capability re-analysis

The correct approach to facilitating further reductions in variability after a Six Sigma project has already made improvements is to perform a measurement system capability re-analysis. This step is vital because it ensures that the measurements being used to evaluate the process are accurate and reliable. If the measurement system is not capable, the data collected may not truly reflect the improvements made or the true variability present in the process. Analyzing the measurement system helps to identify potential sources of error that could mask or interfere with further variability reduction efforts. By confirming that the measurement techniques and tools being utilized are effective, one can confidently assess process performance and pursue additional quality improvements. In contrast, while developing a control plan is essential for maintaining improvements, it does not directly address variability in the measurement process. Holding a brainstorming session may generate ideas for further improvements, but it may not yield actionable insights unless grounded in thorough analysis. Similarly, performing a failure modes and effects analysis focuses on identifying potential failure points in a process and their impacts, which might not directly lead to immediate actions for reducing variability.