Six Sigma is a data-driven approach to process improvement that focuses on reducing defects. It involves identifying and removing the causes of errors and minimizing variability in manufacturing and business processes. The key goals are to improve customer satisfaction and lower costs. Typical Six Sigma projects follow the DMAIC methodology which stands for Define, Measure, Analyze, Improve, and Control. Companies that have implemented Six Sigma programs have reported annual savings of $1.5 billion at Sun Microsystems, $600 million at JP Morgan Chase, and $500 million at Honeywell.