Check this point against current official guidance before relying on it.
Think of your answer, then check it.
Six sigma is a data-driven methodology for reducing process variation and defects, built on the work of quality leaders: Shewhart (control charts/statistical process control), Deming (PDCA popularization, 14 points, system thinking), Juran (quality trilogy: planning/control/improvement; 'fitness for use'), and Ishikawa (cause-and-effect/fishbone diagram, quality circles).
Remember: Shewhart charts it, Deming cycles it, Juran plans it, Ishikawa fishbones it.
An original study card from this course. Practice results do not predict your exam score.