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Five Principles

What is Meant by
Process Control

Understanding Variation

Actionable Data

Statistical
Problem Solving

Process Definition

A Thought About Change

Operational Definitions

Definition of
Problem Statements

Balancing Reliability

Keeping Things
in Perspective

The Need to
Measure Progress


Understanding Variation

While every process displays variation,
some processes display controlled variation,
while others display uncontrolled variation.

Walter A. Shewhard, PhD



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