Lecture 2 Quality Theory
Ming-Hung Shu, Professor Kuas-IE&M

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Outline
 Quality Theory
 What is Theory?  Inductive Reasoning v.s. Deductive Reasoning

 Leading Contributors to Quality Theory
 Dodge; Fisher; Shewhart; Deming; Crosby; Juran;

Feigenbaum; Ishikawa; Taguchi; Conclusion

 Quality Management Evolution
 Lean Six-Sigma Evolution; Holistic Views of Quality Evolution

Viewing Quality Theory from a Contingency

Perspective
 Quality Theory Implementation Depends on ambient

Environment
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Quality Theory
Defining Theory Inductive Reasoning v.s. Deductive Reasoning

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Defining Theory
 A coherent group of general propositions

used as principles of explanation for a class of phenomena.  An example for quality theory

Quality Improvement

Worker Morale

Proposition

Explain

Phenomena

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Induction v.s Deduction
 Induction
 Collect data and then find out general phenomena (Chs. 2

and 10)

 Deduction
 State hypotheses and assume models, and then collect

data to support the statements. (Chs. 11-12)

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Leading Contributors to Quality Theory
Dodge: AS Fisher: DOE Shehwart: Control Chart Deming: Application Crosby Juran Feigenbaum Ishikawa Taguchi
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Harold F. Dodge (1893-1976)
 Developed Acceptance Sampling

(AS) methodologies in 1928
 A form of inspection applied to lots or

batches of items before or after a process to judge conformance to predetermined standards  Inspection after production  AS is an auditing tool
 Useful for reducing defectives selling

in the market, but inferior for intrinsic