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Project Management & Agile · Advanced

Sigma Level

A measure of process capability expressing how many standard deviations fit between the mean and nearest specification limit.

Definition

With the conventional 1.5 sigma long-term shift, 3 sigma is about 66,807 DPMO, 4 sigma about 6,210, 5 sigma about 233, and 6 sigma 3.4.

Example

A process at 5,000 DPMO operates at roughly 4.1 sigma.

Exam tip

The 1.5 sigma shift is assumed in standard sigma tables.

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