Six Sigma Complete Methodology Guide
with Key Concepts and Exam Practice
Six Sigma Management Philosophy ✔ well developed approach to quality improvement, uses
statistics and management by fact, is effective in manufacturing and services firms
Six Sigma ✔ A comprehensive and flexible system for achieving, sustaining and maximizing business
success. Driven by a close understanding of customer needs, disciplined use of facts, data, and
statistical analysis and diligent attention to managing, improving, and reinventing business
processes.
Sigma ✔ amount of variation in a process around the mean value for that
process
6 Sigma ✔ 3.4 defects per million
5 Sigma ✔ 230 defects per million
4 Sigma ✔ 6,210 defects per million
3 Sigma ✔ 66,800 defects per million
2 Sigma ✔ 308,000 defects per million
1 Sigma ✔ 690,000 defects per million
Measure of Central Tendency ✔ what the average piece/metric looks like
Measure of Dispersion ✔ how the data looks around median; range, sample variation and deviation
In Control Process (Control Charts) ✔ when variation falls within the upper control limit and lower
control limit
