How Six Sigma Differs from Traditional Quality Model
Six Sigma is completely different from the traditional quality model of process capability. Traditional quality model was applied only to manufacturing processes, while Six Sigma is applied to all important business processes. Traditional quality model was known as Three Sigma.
Three Sigma had a process standard deviation of less than one-sixth of the total allowable spread. Six Sigma requires the process standard deviation at less than one-twelfth of the total allowable spread. These differences are far more reflective than one might realize.
Read my previous post titled “Driving Value through Lean Six Sigma” to know more about Lean Six Sigma.