Six Sigma is a data-driven improvement philosophy that views all activities within an organization as processes whose inputs can be controlled to effect significant improvements in process outputs. Six Sigma uses a rigorous and systematic methodology known as DMAIC (define, measure, analyze, improve, and control) and several qualitative and quantitative tools for driving process, product, and service improvements aimed at reducing defects and variation. Companies across various industries are striving to become faster and more responsive to customers, achieve near-perfect quality, and operate using world-class cost structures.