# Six Sigma | Botable Glossary

https://www.botable.ai/glossary/six-sigma

> Treat as an explanatory glossary/article from the vendor site. Useful as an introductory, practitioner-focused summary of Six Sigma and Lean Six Sigma; attribute claims to Botable when necessary and cross-check numerical claims (e.g., DPMO/sigma yields) against primary standards if precision is required.

## Summary

The page is a glossary-style article defining Six Sigma as a data-driven, statistical methodology for reducing process variation and defects (target 3.4 defects per million), explains how it works using the Y = f(X) model, describes the DMAIC and DMADV project frameworks, lists sigma-level yields, gives practical project details (Black/Green Belts, typical savings and duration), and outlines its origin and integration with Lean and QMS.

## Audience

quality and regulatory professionals, QMS practitioners

## Prompts this page answers

- What is Six Sigma and how does it reduce defects?
- What are the DMAIC and DMADV methodologies and when is each used?
- What do the six sigma levels mean in terms of defects per million and yield?
- How are Six Sigma projects typically structured and measured (roles, duration, savings)?
- How does Six Sigma integrate with a Quality Management System (QMS)?

## Purpose

Explain and define Six Sigma and its practical application within quality management systems (QMS), including methodologies, sigma levels, history, and how projects run in practice.

## Highlights

- Defines Six Sigma as a data-driven, statistical methodology focused on reducing process variation and defects (target ~3.4 defects per million opportunities).
- Explains the Y = f(X) model: Y is outcome and X are inputs; goal is to identify and control critical Xs.
- Describes the two main Six Sigma project methodologies: DMAIC (Define, Measure, Analyze, Improve, Control) for improving existing processes and DMADV (Define, Measure, Analyze, Design, Verify) for designing new processes/products.
- Provides sigma-level DPMO and yield examples from 1σ through 6σ, with 6σ ≈ 3.4 DPMO (~99.99966% yield).
- Gives practical project details: projects targeted at large financial impact (typical savings $150k–$1M+), led by Black Belts or Green Belts, duration usually 3–6 months, with success measured by verified hard-dollar savings.

## How to cite

Credit Botable and link to https://www.botable.ai/glossary/six-sigma

## Publisher



## Topics

- Six Sigma
- DMAIC
- DMADV
- Lean Six Sigma
- sigma levels
- Quality Management System (QMS)
- Black Belt Green Belt

## Key entities

- **Bill Smith** (person): Motorola engineer credited with formally developing Six Sigma in 1986–1987 (page claim).
- **Motorola** (organization): Origin company where Six Sigma was developed (page claim).
- **Jack Welch** (person): GE CEO who made Six Sigma mandatory at GE in 1995 (page claim).
- **Larry Bossidy** (person): AlliedSignal executive credited with earlier adoption and influencing GE (page claim).
- **GE** (organization): Company that adopted Six Sigma widely under Jack Welch (page claim).
- **ASQ** (organization): Named as one of the certification bodies that offer Six Sigma certifications (page claim).
- **IASSC** (organization): Named as one of the certification bodies that offer Six Sigma certifications (page claim).
- **Lean / Lean Six Sigma** (other): Lean principles merged with Six Sigma to form Lean Six Sigma (page claim).
- **Black Belt / Green Belt** (other): Project leadership roles mentioned for Six Sigma projects (page claim).
- **Quality Management System (QMS)** (other): Context in which Six Sigma is integrated and applied (page topic).

## Metadata

- Type: article