Six Sigma is one of the most popular and successful quality management tools around. The process improvement system, which was birthed at Motorola, has become famous for saving organizations money and helping them improve their quality processes. Yet, as the Six Sigma certification process has blossomed, it has also incorporated more room for error. Praveen Gupta, director of corporate quality at Prysm, a maker of large display solutions, and a longtime quality teacher, says that this is often because leaders and employees get lost in the statistics. Instead of focusing on statistical tools, we should concentrate on process knowledge and statistical thinking, he explains.