How is the six sigma defined?

Six Sigma is a data-driven methodology aimed at improving processes by reducing defects and variability. It employs a set of quality management tools and techniques, focusing on measuring and analyzing performance to achieve near-perfect quality levels, specifically aiming for no more than 3.4 defects per million opportunities. The approach is structured around the DMAIC framework (Define, Measure, Analyze, Improve, Control) for existing processes and DMADV (Define, Measure, Analyze, Design, Verify) for new processes. Ultimately, Six Sigma seeks to enhance customer satisfaction and operational efficiency.