The following references will provide a very nice overview of the field – from general theory to in-depth case studies:
2) Six SIGMA Leadership Handbook by Rath and Strong Staff, John Wiley & Sons 2003.
3) Jack Welch and the GE Way: Management Insights and Leadership Secrets of the Legendary CEO by Robert O. Slater, McGraw-Hill 1998.
4) Six Sigma for Everyone by George Eckes, John Wiley and Sons 2003.
5) Six Sigma Knowledge Design by Mikel J. Harry, Ph.D., Tri-Star Publications 2002.