A free, self-paced textbook in 6 chapters. Read a chapter, then drill it with the 215 companion flashcards using spaced repetition.
Six Sigma is a data-driven methodology aimed at reducing process variation and eliminating defects, with the ultimate quality goal of 3.4 defects per million opportunities (DPMO)....
Lean complements Six Sigma by targeting waste, or muda—any activity that consumes resources without creating customer value. The classic seven wastes, remembered by the acronym DOW...
Understanding customer needs is the starting point for meaningful improvement. The Voice of the Customer (VOC) is captured through surveys, interviews, focus groups, and complaint...
Six Sigma relies on a broad toolkit of statistical methods to analyze data and verify improvements. The empirical rule—68% within ±1σ, 95% within ±2σ, and 99.7% within ±3σ—underpin...
Statistical Process Control (SPC) uses control charts to distinguish common cause variation, which is inherent and predictable, from special cause variation, which comes from exter...
Beyond DMAIC, Six Sigma draws on a wide portfolio of quality tools for problem-solving and planning. Fishbone (Ishikawa) diagrams categorize potential root causes into the 6 Ms—Man...