Common cause

Decision Type:

Method Category:

Categories: Terms

The source of natural variation affecting all the individual item characteristic output values. In SPC it appears as part of the random process variation.

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In-Control State
A process that exhibits only random, common cause variation (as opposed to chaotic, assignable, or special cause variation). A process operating with only random variation is statistically stable.

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About Fred Schenkelberg

I am the reliability expert at FMS Reliability, a reliability engineering and management consulting firm I founded in 2004. I left Hewlett Packard (HP)’s Reliability Team, where I helped create a culture of reliability across the corporation, to assist other organizations.

About Fred Schenkelberg

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