In quality management, this distinction matters because a stable process is not necessarily a good process.
Imagine a machine manufacturing a component that is supposed to measure exactly 10 centimeters.
It produces one at 10.8 centimeters, then another at 10.8, and another.
The machine is remarkably precise.
It's also wrong.
Lean Six Sigma and measurement system analysis separate these concepts because reducing variation alone doesn't solve the problem.
The American Society for Quality describes measurement systems in terms that include repeatability and reproducibility, along with characteristics such as bias and stability.
Bias is particularly important because a measurement system can be extremely consistent while being systematically displaced from the truth.
It can miss the bullseye in exactly the same direction every time.
That is manageable when we're measuring manufactured parts.
it becomes much more consequential when we're measuring people, performance, intelligence, risk, or truth.
In quality management, this distinction matters because a stable process is not necessarily a good process.
Imagine a machine manufacturing a component that is supposed to measure exactly 10 centimeters.
It produces one at 10.8 centimeters, then another at 10.8, and another.
The machine is remarkably precise.
It's also wrong.
Lean Six Sigma and measurement system analysis separate these concepts because reducing variation alone doesn't solve the problem.
The American Society for Quality describes measurement systems in terms that include repeatability and reproducibility, along with characteristics such as bias and stability.
Bias is particularly important because a measurement system can be extremely consistent while being systematically displaced from the truth.
It can miss the bullseye in exactly the same direction every time.
That is manageable when we're measuring manufactured parts.
it becomes much more consequential when we're measuring people, performance, intelligence, risk, or truth.
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