Quick answer: Six Sigma is a data-driven methodology for reducing defects and variation in a process, using statistical tools and a structured five-phase framework called DMAIC (Define, Measure, Analyse, Improve, Control). It originated in manufacturing but is now used across almost every industry to improve quality and consistency. Six Sigma is often taught alongside Lean (as “Lean Six Sigma”), but you can also study Six Sigma’s core statistical tools on their own, typically starting with a Yellow Belt certification.
If you searched just “six sigma” rather than “lean six sigma,” you’re probably trying to understand the term on its own terms, or wondering whether you need the full Lean Six Sigma combination or something more focused. Both are worth clearing up.
The problem behind this search
Six Sigma gets used loosely in workplaces — as a buzzword, a job requirement, or a certification someone mentioned you should get. That ambiguity is the real issue: without a clear, non-jargon explanation, it’s hard to know whether Six Sigma is the right investment of your time, or how it’s different from the “Lean Six Sigma” term you might also be seeing.
What Six Sigma actually measures
The name comes from a statistical goal: a process operating at “six sigma” quality produces no more than 3.4 defects per million opportunities — essentially near-perfect consistency. You don’t need to master the statistics to get value from it. What matters day-to-day is the DMAIC framework it’s built on:
- Define the problem and project goals
- Measure current process performance
- Analyse the data to find root causes
- Improve the process based on evidence
- Control the improved process so gains stick
Six Sigma vs. Lean Six Sigma — which do you need?
Six Sigma on its own focuses on reducing defects and variation through statistics. Lean adds a complementary focus on eliminating waste and speeding up processes (see our full What Is Lean Six Sigma? guide for the combined picture). Most professionals end up learning both, which is why “Lean Six Sigma” has become the standard certification path — but if you’re just starting out, our Six Sigma Yellow Belt course teaches core Six Sigma and Lean fundamentals together, with no prerequisites, for $575.
Why learn it with us rather than a generic online course
We’ve trained Six Sigma and Lean Six Sigma professionals since 2016, with organisations across Australia and APAC — including William Buck, Visy Board, Power Water Corporation and Metro Mining Ltd — putting their teams through our programs. Every course is self-paced with personalised trainer support, and 90% of students who start actually finish, which is well above typical completion rates for online certification courses.
Graduates who’ve progressed through to Black Belt describe the experience this way:
“The course content was practical, well-structured, and directly applicable to real business challenges. The support throughout was excellent.” — Kylie B, Black Belt Graduate
Where to start
The Yellow Belt is the standard entry point: no prerequisites, roughly 4–6 hours of self-paced study, and an internationally recognised certification at the end. From there, most people progress to Green Belt and then Black Belt as they take on bigger improvement projects.
FAQ
Is Six Sigma the same as Lean Six Sigma?
No. Six Sigma focuses on reducing defects and variation using statistical tools. Lean Six Sigma combines that with Lean’s focus on eliminating waste. Most modern certifications, including our Yellow Belt, teach both together as a practical starting point.
Do I need a statistics or engineering background?
No. Six Sigma Yellow Belt has no prerequisites and is designed for quality team members, supervisors, entrepreneurs and business managers alike.
How much does Six Sigma certification cost?
Our Six Sigma Yellow Belt certification is $575, self-paced, with a 30-day completion window.