If your company designs any product, you undoubtedly have experienced failures that are broadly classified into two categories:

1.) marketing flops

2). technical flops

or worse yet, BOTH.

Design for Six Sigma accomplishes two major goals: 1). designing a product that someone will actually purchase, and be glad to hand over their money and 2). designing a product that works properly, the very first time, right out of the box, with NO DEBUGGING (yes we are serious). 

DFSS is an extension of Six Sigma, concentrating on satisfying a true market need (not someone's idea du jour), verifiable engineering solutions, long-term capability, reliability and robustness to the "stuff that happens" every day in its normal usage.  This, of course, translates into revenue for your company, and lots of it.