Picture a factory so smooth it spits out only 3 bad parts in a million and ships faster than you can finish your coffee—that dream has a name: Lean Six Sigma.

Lean Six Sigma = “cut the waste + kill the defects” using facts, numbers and teamwork — a “fact-based, data-driven philosophy that values defect prevention over detection.”

Part What it does Everyday idiom Goal
Lean Remove steps that add zero value (8 wastes) “Trim the fat” Speed & flow
Six Sigma Shrink variation so the process stays within ± 6 σ (≤ 3.4 DPMO) “Hit the bull’s-eye every time” Accuracy & consistency

Together you get work that is fast and almost flawless.

Tiny history timeline

Year Milestone Why it matters
1940-1970s Toyota pioneers Kaizen & Just-in-Time (Lean roots) First big “waste hunt”
1986 Motorola coins Six Sigma to chase 3.4 defects/MO Sets the quality bar
1995-2000s GE & Honeywell merge Lean + Six Sigma; report multi-billion savings Proof it pays
Today Used in healthcare, IT, finance, telecom, services Beyond factories
  1. Start with the customer — what do they care about most?
  2. Map the value stream and spotlight waste.
  3. Attack root causes with data, not opinions.
  4. Fix, test, lock in the new way.
  5. Chase “better every day.” Culture beats tools.
Phase Plain-English task Key questions
D – Define Say the problem in one clear sentence. Who hurts? How big?
M – Measure Grab numbers that show today’s truth. How bad is it?
A – Analyze Ask “Why?” until the root shows. What really causes it?
I – Improve Pilot fixes; pick the best. Did the needle move?
C – Control Hold the gains with simple checks. Will it stick?
  • Value-Stream Map — see the whole flow
  • 5 Whys + Fishbone — dig to the root
  • Takt Time & Heijunka — balance the load
  • Control Chart — watch variation
  • Kanban Board — pull, don’t push
  • Poka-Yoke (mistake-proof) — design the oops out

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Setting Problem ➜ Result Bottom-line gain
Car plant Paint defects ↓ 60 % ≈ $1 M saved/yr
Hospital ER Wait 45 min ➜ 18 min Happier patients
Call center Billing errors ↓ 80 % Fewer complaints

(Real numbers vary by site; these are typical project wins reported by GE, Honeywell, NHS and others.)

  • Moving from 4 σ (6 210 DPMO) to 6 σ (3.4 DPMO) can double customer-satisfaction scores and cut cost-of-poor-quality by 30-50 % .
  • Typical Lean Six Sigma projects return 2-5 × their cost within 12-18 months (GE’s first five years: ≈ $12 B).
Pitfall Easy fix
Using complex stats for a tiny issue Match tool to task.
“Training belts” but ignoring frontline Involve everyone early.
Leader cheer-on with no time Start with one quick, visible win.
No control plan Simple checks, clear owners, visual dashboards.

“Lean Six Sigma is a fact-based, data-driven philosophy that values defect prevention over detection.” — American Society for Quality (ASQ)

  • DPMO — Defects Per Million Opportunities (goal ≤ 3.4).
  • Takt Time — Beat of customer demand.
  • Kaizen — Tiny daily improvements.
  • Heijunka — Level-loading the workload.

Lean Six Sigma turns simple math + common sense into faster, cheaper, better work. Map one small process this week—making coffee, closing a ticket, prepping an invoice—spot one waste or variation, fix it, and watch the ripple spread. When you’re ready for step-by-step guidance, dive into the full course linked at the end of this post.

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