SPC_Training.pptx

SPC training

06/05/2022

Beginnings of SPC

Dr. Walter Shewhart pioneered Industrial Control (SPC) in the

1920’s & 30’s.

The U.S. used industrial control very successfully during WWII.

After the war, U.S. industries dropped industrial control in favor of a

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Definition of Quality

“Fitness for purpose or use” (Juran).

“The totality of features and characteristics of a product or service

that bear on its ability to satisfy stated or implied needs” (ISO

8402: 1986).

outcome of engineering and manufacturing practice, or

conformance to specifications

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What is a Process?

The transformation of a set of inputs (materials, methods,

operations) into a set of outputs (products, information,

services - more generally - results)

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P

r

o

People

(skills, training,

knowledge)

Environment

Records

Equipment

What is Control?

Control refers to the measurements of the performance of a

process and feedback required for corrective action.

A process is said to be operating in a state of statistical control

when common causes are the only source of variation.

Statistical control is not a natural state for most processes

It is an achievement, one by one, special cause

The initial function of a process control system is to provide a

statistical signal when special causes of variation are present,

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