Six Sigma was first developed in Motorola by Bill Smith, then Mikel Harry, to measure quality.

Over 1990, Deming, Juart, Shewhart, Ishikawa, Shingo, and Taguchi developed the continuous improvements tools.

Continuous improvement is about not stopping to the actual sigma level by refining your process to achieve a higher level of sigma, maybe prioritizing the area of improvement.

Now it has evolved in a project approach that follow the DMAIC cycle approach.


Joseph Juran

  • Developed the 80/20% Pareto principle;
  • Juran was one of the first to write about the cost of poor quality;
  • Important phrase “It is most important that top management be quality-minded. In the absence of sincere manifestation of interest at the top, little will happen below.”.


Walter A Shewhart

  • Father of the statistical quality control wich employs statistical methods to monitor and control quality
  • Invented the Plan-Do-Study-Act cycle


W. Edwards Deming

  • Invent of the Plan-Do-Check-Act cycle
  • Invent of some sampling technique

Kaoru Ishikawa

  • Father of japones quality
  • Invent the Fishbone diagram

Genichi Taguchi

  • Invent a method (Taguchi method) to improve quality and reduce cost;
  • Quality lost function: Quality loss function is a method of measuring losses that are incurred due to not perfect, however compliant production.

Philip B. Crosby

  • Concept of zero defect: “Zero Defects is a management tool aimed at the reduction of defects through prevention. It is directed at motivating people to prevent mistakes by developing a constant, conscious desire to do their job right the first time.” Zero Defects: A New Dimension in Quality Assurance.

Armand V. Feigenbaum

  • Total Quality Control: It’s about controlling all the life cycles step of the product to prevent defects instead of fixing them at the end.

Bill Smith

  • Father of six sigma at motorola

Mikel Harry

  • Father of six sigma at motorola

Robert W. Galvin

  • Father of six sigma at motorola

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