How does Six Sigma primarily measure performance?

Six Sigma primarily measures performance through defect rates and quality control because the methodology is fundamentally focused on reducing variability and eliminating defects in processes. By assessing how many defects occur per million opportunities, Six Sigma allows organizations to quantify their performance in delivering products and services that meet quality standards. This quantitative measurement helps identify areas for improvement, streamline operations, and enhance customer satisfaction.

While financial metrics, employee feedback, and project completion timelines are important aspects of overall business performance, they do not capture the core objective of Six Sigma, which is to achieve process excellence through defect reduction and optimization of quality control processes. These elements may be relevant in broader performance evaluations, but they do not directly align with the specific goals and methods employed within the Six Sigma framework.