Quick answer: No — Lean and Six Sigma are two distinct methodologies that are usually taught and applied together. Lean focuses on eliminating waste and non-value-adding steps to speed up a process. Six Sigma focuses on reducing defects and variation using statistical analysis, structured around the DMAIC framework (Define, Measure, Analyse, Improve, Control). Combined as “Lean Six Sigma,” they give you one toolkit for making a process both faster and more consistent, which is why almost all modern certifications — including ours — teach them as a single discipline rather than two separate ones. (For a closer look at Six Sigma on its own, see What Is Six Sigma?.)
If you searched “lean and six sigma” specifically, you’ve probably already noticed the two terms used interchangeably in job ads, training brochures, or workplace conversations, and want a straight answer on whether that’s accurate.
The problem behind this search
The confusion is understandable — “Lean,” “Six Sigma,” and “Lean Six Sigma” get used loosely, sometimes as synonyms, sometimes not. If you’re deciding what to study or which project methodology to apply, that ambiguity matters: picking the wrong framing can mean you invest time in a course that doesn’t match what your employer actually means by “Lean Six Sigma.”
What each one actually contributes
Lean targets the process itself — cutting steps that don’t add value for the customer, reducing waiting time, and using tools like 5S, Kaizen, Kanban and Value Stream Mapping to keep things moving.
Six Sigma targets the outcome’s consistency — using statistical tools to find and remove the root causes of defects and variation, following the DMAIC framework.
Put together, Lean and Six Sigma solve two different but complementary problems: Lean makes a process faster, Six Sigma makes it more reliable. That’s the combination our Green Belt and Black Belt certifications are built around, using real case studies rather than abstract theory.
Why learn the combined approach with us
We’ve been teaching the combined Lean and Six Sigma methodology since 2016, to organisations across Australia and APAC — including William Buck, Visy Board, Power Water Corporation and Metro Mining Ltd. Courses are self-paced online with personalised trainer support, and 90% of students who enrol go on to complete their certification.
Here’s what graduates of our combined Green Belt and Black Belt programs say:
“The course content was highly practical and immediately relevant, while the support provided throughout was prompt and effective.” — Rochelle J, Green Belt Graduate
“I found the course content to be well-structured, practical, and easy to follow. The support provided throughout the course was prompt.” — Lydia Y, Green Belt Graduate
“The course content was practical, well-structured, and directly applicable to real business challenges. The support throughout was excellent.” — Kylie B, Black Belt Graduate
Which certification combines both properly?
Our Lean Six Sigma Green Belt course is where Lean and Six Sigma tools are taught together in full, building on the Yellow Belt fundamentals. For teams who want to fast-track the whole pathway, the Yellow + Green + Black Belt bundle covers Lean and Six Sigma end to end, from entry level through to leading complex improvement projects.
FAQ
Are “Lean” and “Six Sigma” the same methodology?
No. Lean eliminates waste and speeds up processes; Six Sigma reduces defects and variation using statistics. They’re distinct but complementary, which is why they’re usually taught and applied together as “Lean Six Sigma.”
Can I learn just Lean, or just Six Sigma, without the other?
You can start with core Six Sigma fundamentals at Yellow Belt level, but Green Belt and above teach the combined Lean and Six Sigma toolkit, since that’s how it’s applied in most workplaces.
Which certification should I choose if my employer just said “Lean Six Sigma”?
Green Belt is the standard reference point most employers mean when they say “Lean Six Sigma certification.” Black Belt is the advanced level for leading larger improvement initiatives.