Page 383 - Design for Six Sigma a Roadmap for Product Development

Chapter
10

Design for X

10.1 Introduction
This chapter, for the most part, focuses on the product. This is attrib-
uted to the evolution of the Design for X family of tools in manufac-
turing industries. We will focus on only a vital few members of the
DFX family. However, DFSS teams with transactional projects can still
benefit from this chapter by drawing analogies between their
processes and/or services and the topics presented here, in particular,
Design for Serviceability (DFS) and Design for Life-Cycle Cost using
activity-based costing with uncertainty. Many transactional DFSS
teams found the concepts, tools, and approaches presented here very
useful, acting in many ways as eye-openers by stimulating out-of-the-
box thinking.
The concurrent engineering is a contemporary approach to DFSS.
The black belt should continually revise the DFSS team membership
to reflect the concurrent design, which means that both design and
process members are key, equal team members. DFX techniques are part
of detail design and are ideal approaches to improve life-cycle cost, *
quality, increased design flexibility, and increased efficiency and produc-
tivity using the concurrent design concepts (Maskell 1991). Benefits
are usually pinned as competitiveness measures, improved decision
making, and enhanced operational efficiency. The letter “X” in DFX is
made up of two parts: life-cycle processes x and performance measure
(ability): X x ability (Huang 1996). In product design, for example,

* Life-cycle cost is the real cost of the design. It includes not only the original cost of
manufacture but also the associated costs of defects, litigations, buybacks, distributions
support, warranty, and the implementation cost of all employed DFX methods.

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