http://www.brighthubpm.com/six-sigma/69025-relationship-between-cmmi-vs-six-sigma/

• personal note about excellent article coming from http://www.brighthubpm.com/six-sigma/69025-relationship-between-cmmi-vs-six-sigma/

• What Is CMMI?

  CMMI or Capability Maturity Model Integration provides organizations with goals and a set of expected practices needed to meet such goals in several disciplines. A group of industry, government, and software engineering Institute representatives have developed these goals and the expected practices by compiling the best practices of various capability models over the years.
  

  CMMI has 5 levels that gage the extent of compliance with such expected practices.

  What Is Six Sigma?

  Six Sigma is a statistical based approach to business improvement that aims to eliminate defects as perceived by customer. The Six Sigma philosophy views everything as a process that has inherent variability and aims at containing such variability to 3.4 per million opportunities.
  Six Sigma methods collect data and use statistical analysis to understand the extent of variation from the desired levels and drive decisions to improve the processes by eliminating variability.