Six Sigma

Sigma (the Greek letter σ) is a term in statistics that measures standard deviation. Pioneered by Motorola, Six-Sigma is a set of methods and tools designed to focus on the reduction of variation within any process to improve quality outputs. The methodology utilises statistical concepts to measure a process in terms of defects and achieving Six Sigma means that processes are delivering only 3.4 defects per million opportunities (DPMO).