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Project Management & Agile · Foundational

Six Sigma

Data-driven quality methodology aiming to reduce process variation to no more than 3.4 defects per million opportunities.

Definition

Developed at Motorola in the 1980s and popularized by GE, it uses DMAIC for improving existing processes and DMADV/DFSS for new designs, supported by a belt-based role structure.

Example

A call center uses Six Sigma to reduce billing errors from 2% to 0.1%.

Exam tip

Six Sigma reduces variation; Lean reduces waste; Lean Six Sigma combines both.

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