Page 62 - Six Sigma Advanced Tools for Black Belts and Master Black Belts

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The IDOV Roadmap 47
for showing that C pk is greater than say, C pk0 − , where C pk0 is the true value, is given
by
2
(Z α + Z β ) (9C 2 + 2)
pk0
n = .
18 2
The above approximation works well for large n(>50) and C pk0 >1, as it is based on
an asymptotic result for C pk .
A consolidated table summarizing the DFSS tools and their respective purposes is
given in Table 4.3. For a seasoned Black Belt who is conversant with DMAIC tools,
acquiring three additional tools, namely, QFD, design for reliability, and Monte Carlo

Table 4.3 Six Sigma tools and their objectives in DFSS.

Quality tools Purpose
Identify Project management tools such as Gantt To develop a project charter
charts and critical path analysis To identify customers
Voice of customers To translate customers’wants into

QFD; FMEA, Benchmarking; Stakeholder product design requirements;

analysis; leverage chart; Pareto charts requirements into specifications
and to perform gap analysis
Design Brainstorming; affinity diagram; reality To formulate design concepts
trees To brainstorm conceptual design
TRIZ (theory of inventive problem To get measurement systems

solving); cause-and-effect analysis ready for design evaluation
Gage R&R To evaluate design options
Statistical thinking; t-, F-test, ANOVA To identify KPOVs and KPIVs
Screening experiments To evaluate design sensitivity to
Robust design environment changes
Response surface method, multiple To develop transfer functions
regression

Optimize Monte Carlo simulation To perform statistical tolerancing
Capability analysis To analyze and optimize
Design for reliability capability measures
Two-level fractional factorials To develop reliability metrics and
DFSS score card to conduct accelerated testing
To demonstrate feasibility and
conduct sensitivity analysis
To review current design
achievement

Validate Sample size determination To conduct confirmatory runs
Statistical process control To design control plan and
Poka-yoke(mistake proofing) develop control charting tools
To error proof design and
processes