The document discusses the history and methodology of Six Sigma. It began at Motorola in the 1980s to reduce defects in manufacturing processes. General Electric popularized it further in the 1990s. Six Sigma uses statistical methods and aims for near-zero defect rates. It certifies practitioners as Yellow Belts, Green Belts, Black Belts and Master Black Belts. Common project methodologies are DMAIC for improvement and DMADV for new product design. The document also provides case studies of Six Sigma implementation at Samsung and LG Electronics which achieved significant quality and cost improvements.