Page 212 - Design for Six Sigma a Roadmap for Product Development

Chapter
6

DFSS Transfer Function and
Scorecards

6.1 Introduction
Functional analysis and physical synthesis are the premier activities
performed in the characterization (C) phase of the DFSS algorithm. In
the following sections, we distinguish both of these activities, offer con-
ceptual framework for their use, and link these concepts to the rest of
the DFSS algorithm. The analysis part of the DFSS algorithm is cov-
ered in Chaps. 7 to 18. This chapter focuses on design synthesis. In
addition to design synthesis, the other two major entities that are pre-
sented here are the transfer function and the design scorecard. A trans-
fer function is the means of optimization and design detailing and is
usually documented in the scorecard. It is treated as a living entity
within the DFSS algorithm that passes through its own life-cycle
stages. A transfer function is first identified using the zigzagging
method and then detailed by derivation, modeling, or experimentation.
The prime uses are optimization and validation. Design transfer func-
tions belonging to the same hierarchical level in the design structures
should be recorded in that hierarchical level scorecard. A scorecard is
used to record and optimize the transfer functions. The transfer func-
tion concept is integrated with other DFSS concepts and tools such as
synthesis block diagram, robust design P-diagram, and design mapping
within the rigor of design scorecards.
This chapter is linked in every way possible to all related DFSS algo-
rithm concepts and tools. This link is particularly critical to Chap. 5,
and occasional reference will be made where value can be gained.

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