Six Sigma

Sigma in statistics is used to represent deviation from the norm. It can beused for process improvement by measuring if a production(software) or service is near perfect in quality by eliminating defects.

For process to be certified as having Six Sigma quality, it must have at the maximum 3.4 defects per million opportunities (DPMO).

The key sub-methodologies by which Six Sigma quality can be achieved are

• DMAIC (Define, Measure, Analyze, Improve and Control) -
  which is used fore incremental improvement of existing processes that are below Six Sigma quality
• DMADV (Define, Measure, Analyze, Design, Verify) -
  which is used to develop new processes for Six Sigma products and services. It can also be used for new versions of the products service when the extent o changes are substantially greater than what incremental improvements can address