Quality & Operations Credential Verification
How to Verify a Six Sigma Certification (Black Belt, Green Belt)
Six Sigma certifications have no single governing body — multiple organizations issue them, and the bar varies significantly. Here's how to verify what a candidate actually holds and what it means.
Quick answer
The issuing organization matters more than the belt level. Ask the candidate which organization issued their certification. For ASQ certifications, verify at asq.org/cert/verify. For IASSC, verify at iassc.org. Employer-issued Six Sigma belts (GE, Motorola, etc.) require employer confirmation. There is no universal Six Sigma registry.
The Six Sigma certification landscape
Unlike nursing or accounting, Six Sigma has no single regulatory body. Certifications are issued by professional associations, private training companies, universities, and individual employers. Quality varies considerably:
| Issuer | Credibility | Verification Method |
|---|---|---|
| ASQ (American Society for Quality) | Highest — industry gold standard | asq.org/cert/verify |
| IASSC (International Association for Six Sigma Certification) | High — accredited, independent | iassc.org certification verification |
| Major employer (GE, Motorola, Honeywell) | High — rigorous internal programs | HR confirmation from issuing employer |
| Online training providers (Simplilearn, Coursera, etc.) | Variable — often completion certificates, not exams | Platform profile or completion certificate |
| Unknown/generic providers | Low — no standardization or exam requirements | Ask for course curriculum and exam details |
Verifying ASQ Six Sigma certifications
ASQ offers the most rigorous Six Sigma certifications, including:
- CSSBB — Certified Six Sigma Black Belt
- CSSGB — Certified Six Sigma Green Belt
- CSSYB — Certified Six Sigma Yellow Belt
ASQ certifications require documented project experience in addition to passing an exam. The Black Belt requires demonstrated knowledge of the DMAIC methodology and real-world project results.
To verify an ASQ certification:
- Go to asq.org/cert/verify
- Enter the candidate's name or certification number
- Active ASQ certifications display with the certification type and current status
- ASQ certifications require 18 recertification units (RUs) every 3 years to remain active
Verifying IASSC certifications
IASSC offers vendor-neutral, exam-only certifications:
- ICBB — IASSC Certified Black Belt
- ICGB — IASSC Certified Green Belt
- ICYB — IASSC Certified Yellow Belt
IASSC certifications do not require project experience — they are exam-only. This is a meaningful distinction when evaluating practical capability. IASSC does not have a renewal requirement; certifications do not expire.
Verify at iassc.org through their certification verification tool, or ask the candidate for their IASSC certification number which can be verified directly on the IASSC website.
Belt levels: what they mean
| Belt Level | Typical Role | ASQ Requirement |
|---|---|---|
| Master Black Belt (MBB) | Six Sigma coach, strategist, trainer | Not an ASQ credential; typically employer-issued |
| Black Belt (BB) | Project lead, full-time quality improvement | 3 years work experience, 2 projects documented |
| Green Belt (GB) | Part-time project support, team member | 3 years work experience in area |
| Yellow Belt (YB) | Team member with basic DMAIC understanding | No experience requirement |
Red flags
- Cannot name the certifying organization — “Six Sigma Black Belt” alone tells you nothing without knowing the issuer
- Online course completion certificate misrepresented as a credential — many e-learning providers issue “certificates of completion,” not credential-bearing certifications
- Claims “Master Black Belt” — this is typically an internal employer designation, not an ASQ or IASSC credential; ask who issued it and what the program involved
- ASQ certification not found in the verify tool — may be expired (ASQ requires renewal every 3 years)
- Certifying organization is unknown or a low-reputation online provider — do not treat all “Six Sigma Black Belts” as equivalent
Verification checklist
- 1. Ask the candidate which organization issued their Six Sigma certification
- 2. For ASQ: verify at asq.org/cert/verify — confirm status is Active
- 3. For IASSC: verify at iassc.org using the certification number
- 4. For employer-issued belts: contact the issuing employer's HR department
- 5. For all belts: ask about actual projects completed, results achieved, and methodologies used — practical knowledge matters
Verify the engineering or business degree
Six Sigma practitioners often hold degrees in engineering, operations management, or business. Use VerifyED to confirm whether a claimed institution is properly accredited.
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