The document discusses Six Sigma, a data-driven methodology aimed at quality improvement in organizations, initially introduced by Motorola in the 1980s. It outlines various strategies, tools, and methodologies involved in Six Sigma, such as DMAIC and DMADV, as well as its application in software development, addressing the benefits and challenges associated with its implementation. A case study illustrates the integration of Six Sigma principles into a job portal project, highlighting improvements in system performance and user experience.