Page 246 - Design for Six Sigma a Roadmap for Product Development

216 Chapter Seven

“know-how” knowledge as it relates to customer demand that is pre-
served and transferred to the next design teams.
Certain assumptions are made before QFD can be implemented.
They include (1) forming a multidisciplinary DFSS team per step 2 of
the DFSS algorithm and (2) more time spent upstream understanding
customer needs and expectations and defining the product or service
in greater detail.
There are many initial realistic concerns, which must be addressed
in order to implement QFD successfully. For example, departments
represented in the team don’t tend to talk to one another. In addition,
market research information that is not technically or design-focused
with QFD is more easily applied to incremental design than to brand
creative design. The traditional reality “problem prevention is not
rewarded as well as problem solving” will be faced initially by the
DFSS team. This reality will fade away as the team embarks on their
project using the rigor of the DFSS.

7.4 QFD Methodology Overview
Quality function deployment is accomplished by multidisciplinary DFSS
teams using a series of charts to deploy critical customer attributes
throughout the phases of design development. QFD is usually deployed
over four phases. The four phases are phase 1—CTS planning, phase
2—functional requirements, phase 3—design parameters planning,
and phase 4—process variables planning. Figure 7.2 shows these four

HOWs
CTSs
HOWs
Functional
WHATs Customer Attributes House of Requirements Parameters HOWs
Quality
Design
#1
WHATs CTSs House of Variables
Process
Quality
Prioritized #2 House of
CTSs WHATs Functional Requirements Quality
Prioritized # 3 WHATs Design Parameters House of
Quality
Functions # 4
Prioritized
Parameters
Prioritized
Variables

Figure 7.2 The four phases of QFD.