Page 114 - Design for Six Sigma a Roadmap for Product Development

Product Development Process and Design for Six Sigma 89

DFSS
B A: Conceptual tools
B: Statistical tools
A
DFSS
A B
DMAIC

A
B

Time
Concept phase Product Manufacturing phase
development phase
Figure 3.15 The DFSS strategy at design entity phases.

it. On the soft side, DFSS drives for cultural change in the deploying
company by shaking current and old paradigms, building success one
project at a time, changing and motivating people, and building new par-
adigms for a decision-making culture, a rich Six Sigma culture.

3.6 Why “Design for Six Sigma?”
The objective of this book is to present the DFSS theory, consisting of con-
cepts and tools that eliminate or reduce both the conceptual and opera-
*
tional types of vulnerabilities of designed entities and releases such
entities at Six Sigma quality levels in all of their requirements, that is,
to have all functional requirements at 6 times the standard deviation on
each side of the specification limits. This target is called Six Sigma, or 6
for short, where the Greek letter stands for the standard deviation.
Operational vulnerabilities takes variability reduction and mean
adjustment of the critical-to-quality requirements, the CTQs, as an
objective and have been the subject of many fields of knowledge such
as the method of robust design advanced by Taguchi (Taguchi 1986,
Taguchi and Wu 1986, Taguchi et al. 1989), DMAIC Six Sigma (Harry
1994, 1998), and tolerance design/tolerancing techniques. Tolerance

*A product, service, or process.