Which of the following metrics is commonly used to measure process performance in Six Sigma?

DPMO, or Defects Per Million Opportunities, is a critical metric in Six Sigma used to assess process performance. This measure quantifies the number of defects in a process relative to the total number of opportunities for error, providing a clear indication of process capability and quality. By focusing on defects and opportunities, DPMO enables organizations to identify areas for improvement, set performance targets, and track progress over time. It also allows for benchmarking against industry standards, making it an essential tool for practitioners looking to implement continuous improvement initiatives in accordance with Six Sigma methodologies.

The other metrics, while valuable in their own contexts, do not serve the same purpose as DPMO in the realm of process performance measurement within Six Sigma frameworks. For instance, the Net Promoter Score and Customer Satisfaction Index focus on customer perceptions and satisfaction levels, which, although important, do not directly gauge process quality or defect rates. Return on Investment measures the profitability of investments made but doesn’t evaluate the performance of processes themselves in relation to quality. Therefore, DPMO stands out as the most relevant metric for assessing and improving processes in Six Sigma.