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. Perform a measurement system capability re-analysis

2. Develop a control plan

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 choice centers around performing a measurement system capability re-analysis. Once a Six Sigma project has successfully reduced variability in a process, it is crucial to ensure that the measurement system is capable of detecting and quantifying that reduced variability effectively. A re-analysis of the measurement system capability allows for the verification that the measures being used are precise and accurate enough to reflect any changes made during the improvement efforts. This step is vital because if the measurement system is not sufficiently capable, it could lead to misleading conclusions about the ongoing improvements and variability. Ensuring the measurement system is robust allows the organization to confidently track further improvements and maintain the gains achieved in the project. Contextually, while developing a control plan is important for sustaining improvements and monitoring processes, it does not directly facilitate further reductions in variability. Instead, it helps maintain the new level of performance achieved. A brainstorming session can generate ideas, but it is typically not a systematic approach for addressing variability. Performing a failure modes and effects analysis is also beneficial in identifying potential issues in processes but is more focused on risk management rather than directly facilitating reductions in variability. Thus, the initial focus on measurement system capability is key to future improvement.