Six Sigma is a process oriented methodology designed to improve business performance by improving specific areas of strategic business processes. There are 2 different methodologies available for carrying out improvements in processes or operations.
Improvements can be of two types: improving the existing process or designing a new process altogether. When we have an existing process and we want to improve the process we deploy the DMAIC methodology. While designing a new process or completely revamping the existing process the Design for Six Sigma or IDOV methodology is deployed.(http://www.managementstudyguide.com/images/six-sigma-process.gif)
Six Sigma Process
DMAIC v/s DFSS
(http://www.managementstudyguide.com/images/six-sigma-dmadv.gif)
(http://www.managementstudyguide.com/images/six-sigma-flowchart.gif)