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Why are there 3 different versions of the course?

There are 3 different versions of each course depending on which textbook edition you are using. The current required textbook is:

“The Six Sigma Handbook, Fourth Edition” by Thomas Pyzdek and Paul Keller (McGraw-Hill Professional; 4 edition (April 22, 2014))

Book Details:
ISBN-10: 0071840532
ISBN-13: 978-0071840538
Format: Hardcover, 608 pages
Pub. Date: April 22, 2014
Publisher: McGraw-Hill Professional
Edition Number: 4

However, students using the now discontinued textbook:

“The Six Sigma Handbook, Third Edition” by Thomas Pyzdek and Paul Keller (Publisher McGraw-Hill; 3rd edition (October 12, 2009))

Book Details:
ISBN-10: 0071623388
ISBN-13: 978-0071623384
Format: Hardcover, 560 pages
Pub. Date: October 12, 2009
Publisher: McGraw-Hill Professional
Edition Number: 3

Or

The Six Sigma Handbook: The Complete Guide for Green Belts, Black Belts, and Managers at All Levels, Revised and Expanded Edition by Thomas Pyzdek (Publisher: McGraw-Hill; 2nd revised edition (March 20, 2003))

Product Details:
ISBN: 0071410155
Format: Hardcover, 848pp
Pub. Date: March 2003
Publisher: McGraw-Hill Companies, The
Edition Description: Revised and Expanded Edition
Edition Number: 2

Can access a compatible version of the program by clicking on the “3rd edition access” link or the “2nd edition access” link.


Originally developed by Bill Smith at Motorola in 1986, the Six Sigma Training program was created using some of the most innovative quality improvement methods from the preceding six decades. The term "Six Sigma" is derived from a field of statistics known as process capability. The term 6 Sigma refers to the ability of manufacturing processes to produce a very high proportion of output within specification. Processes that operate with "six sigma quality" over the short term are assumed to produce long-term defect levels below 3.4 defects per million opportunities. Six Sigma's goal is to improve overall processes to that level of quality or better.