Six Sigma
in 6 Minutes.
Six Sigma is the data-driven, customer-focused methodology used by the world's top organisations to eliminate defects, reduce waste, and achieve near-perfect process performance.
What is Six Sigma?
A Proven System for Process Excellence
Six Sigma is a data-driven, customer-focused, and result-oriented methodology that uses statistical tools and techniques to systematically eliminate defects and inefficiencies to improve processes.
Started in the 1980s at Motorola to reduce variation in manufacturing, it gained global fame when Jack Welch made it central to General Electric's strategy in 1995. Today it spans manufacturing, construction, banking, healthcare, education, government, and IT sectors worldwide.
The term comes from statistical quality control — a Six Sigma process produces 99.99966% defect-free outputs, equivalent to just 3.4 defects per million opportunities.
Statistical Process Control
Uses SQC to evaluate process capability — the numerical measure of a process's ability to meet customer specifications.
Defined Targets
Quantifiable value targets: reduced cycle time, lower cost, higher quality ratings.
Skilled Team Structure
Executive Leadership, Champions, Black Belts, Green Belts, and Yellow Belts working together.
How Good Is Your Process?
The sigma rating of a process indicates its yield — the percentage of
defect-free outputs it produces.
| Sigma Level | Defects Per Million Opportunities | Defect-Free Output | Performance |
|---|---|---|---|
| 6σ — World Class | 3.4 | 99.9997% |
100%
|
| 5σ — Excellent | 233 | 99.98% |
99.98%
|
| 4σ — Good | 6,210 | 99.38% |
99.38%
|
| 3σ — Average | 66,807 | 93.32% |
93.32%
|
| 2σ — Below Average | 308,537 | 69.15% |
69.15%
|
Choose Your Belt Level
Each certification follows a defined sequence of phases with quantifiable
value targets — from awareness to expert practitioner.
How Six Sigma Works
Every Six Sigma project follows a structured 5-phase approach to deliver
measurable, sustainable improvement.
Define
Identify the problem, customer requirements, and project goals
Measure
Collect data on the current process baseline performance
Analyze
Identify root causes of defects using statistical tools
Improve
Develop, test, and implement solutions to address root causes
Control
Sustain gains by establishing controls and monitoring systems
Applied Everywhere
Six Sigma has long outgrown its manufacturing origins. It now drives excellence across virtually every sector.
Manufacturing
Reduce defects and variation on the production floor
Healthcare
Improve patient outcomes and streamline clinical workflows
Banking & Finance
Minimize errors in transactions, lending, and compliance
IT / ITES
Dynamically improve software delivery and service quality
Construction
Optimize project timelines and reduce rework costs
Education
Enhance learning outcomes and institutional efficiency
Government
Deliver public services faster with fewer errors
KPO / BPO
Drive consistency and accuracy across outsourced operations