By Quick answer: Which Six Sigma or quality certification is best in 2027?
- Six Sigma — ASQ Green Belt (100 questions).
- IT service — ITIL 4 Foundation.
- Projects — PMP or CAPM.
- Data — Google Data Analytics.
Key takeaways
- Choose an issuer with a real exam; ASQ is the most recognised.
- Quality roles now need data skills too.
- Bring one improvement project with measured results.
Six Sigma certifications vary wildly in quality: many providers sell belts with little assessment. The credentials employers trust most come from bodies with real exams, especially ASQ. This list sticks to those, plus the project and data skills quality roles need.
Five quality certifications at a glance
Ranked for this reader. Costs and formats come from each issuer's own page, checked on 3 November 2026; prices change, so confirm before you book.
| # | Certification | Cost | Time | Prove it free |
|---|---|---|---|---|
| 1 | Six Sigma Green Belt (CSSGB)ASQ | Check the official page1 | 100-question exam | Free test |
| 2 | ITIL 4 FoundationPeopleCert / AXELOS | Check the official page2 | Check issuer | Free test |
| 3 | PMP – Project Management ProfessionalPMI | $425 PMI members / $675 non-members3 | 240 minutes, 180 questions | Free test |
| 4 | CAPM – Certified Associate in Project ManagementPMI | $225 PMI members / $300 non-members4 | 180 minutes, 150 questions | Free test |
| 5 | Google Data Analytics Professional CertificateGoogle / Coursera | $49/mo Coursera plan5 | 6 months at 10 hours a week | Free test |
Prove it free before you pay for an exam
Take the free test first. Pay for an exam only when you pass.
Every pick above has a matching free practice test on Science of Apps, one of the world's largest libraries of free certification tests (1,200+). Check your level before you pay for an exam, or add a verifiable credential to LinkedIn while you study. (Disclosure: we publish these tests; the certifications above earn us nothing.)
- Six Sigma Green Belt CertificationPractise for Six Sigma Green Belt (CSSGB) before you pay.Start free test →
- ITIL 4 Foundation Practice ExamPractise for ITIL 4 Foundation before you pay.Start free test →
- PMP Practice ExamPractise for PMP – Project Management Professional before you pay.Start free test →
- CAPM Practice ExamPractise for CAPM – Certified Associate in Project Management before you pay.Start free test →
Each certification, and the quality role it fits
- ASQSix Sigma Green Belt (CSSGB)Process improvementCheck the official page
- PeopleCertITIL 4 FoundationIT service qualityCheck the official page
- PMIPMP – Project Management ProfessionalLeading improvement projects$425 PMI members / $675 non-members
Six Sigma Green Belt (CSSGB)
- Cost
- Check the official page1
- Format
- 100-question exam
ASQ's Certified Six Sigma Green Belt is a 100-question exam; ASQ members pay less. It's the most recognised Green Belt. ASQ's Certified Six Sigma Green Belt is a 100-question exam on process improvement methods such as DMAIC and statistical tools. ASQ members pay less, and it's among the most recognised Green Belt credentials.
Best forprocess improvement
ITIL 4 Foundation
- Cost
- Check the official page2
The standard for IT service management, covering service value and continual improvement. PeopleCert's ITIL 4 Foundation covers the core concepts of IT service management and continual improvement. It's foundation-level, quick to prepare for and especially common in IT service roles in the UK and Australia.
Best forIT service quality
PMP – Project Management Professional
- Cost
- $425 PMI members / $675 non-members3
- Format
- 240 minutes, 180 questions
- Entry
- 3–5 years leading projects (by education) plus 35 hours of training
For quality leaders running large improvement programmes. $425 PMI members, $675 non-members. PMI's Project Management Professional is a 240-minute, 180-question exam covering predictive, agile and hybrid approaches. It needs 3–5 years leading projects plus 35 hours of training and costs $425 for PMI members or $675.
Best forleading improvement projects
CAPM – Certified Associate in Project Management
- Cost
- $225 PMI members / $300 non-members4
- Format
- 180 minutes, 150 questions
- Entry
- Secondary diploma plus 23 hours of project management education
PMI's entry credential, useful for early-career improvement project roles. $225 members, $300 non-members. PMI's entry credential is a 180-minute, 150-question exam for people early in project roles. It needs a secondary diploma plus 23 hours of project management education and costs $225 for PMI members or $300.
Best forearly-career project roles
Google Data Analytics Professional Certificate
- Cost
- $49/mo Coursera plan5
- Time
- 6 months at 10 hours a week
Spreadsheets, SQL and Tableau for measuring quality and building control charts. Google's professional certificate teaches spreadsheets, SQL, Tableau and R through case studies and ends with a portfolio capstone. It's designed for beginners, takes about six months at ten hours a week and offers financial aid on Coursera.
Best forquality analysts
Spot a weak Six Sigma certificate
- No proctored exam — be wary.
- No project requirement — at Black Belt level, a red flag.
- Unknown issuer — check if employers in your field name it.
How we ranked these picks
We ranked quality certifications by issuer credibility and exam rigour. Five credible options, so we list five. Fees come from official pages, checked 3 November 2026.
Frequently asked questions
What is the best Six Sigma certification?
ASQ's Six Sigma Green Belt is the most widely recognised.
Green Belt or Black Belt first?
Green Belt first. Black Belt suits people who lead improvement projects full-time.
Are online Six Sigma certifications worth it?
Only from credible issuers with real exams. Check whether employers in your field recognise them.
Which Six Sigma certification is best in India?
ASQ is recognised internationally. Check Naukri for issuers your target employers name.
Is there a free Six Sigma practice test?
Yes. Science of Apps offers free Six Sigma and quality practice tests with instant results.
Sources
- ASQ — Six Sigma Green Belt (CSSGB), official page (checked 3 Nov 2026)
- PeopleCert — ITIL 4 Foundation, official page (checked 3 Nov 2026)
- PMI — PMP – Project Management Professional, official page (checked 3 Nov 2026)
- PMI — CAPM – Certified Associate in Project Management, official page (checked 3 Nov 2026)
- Google — Google Data Analytics Professional Certificate, official page (checked 3 Nov 2026)
- Checked November 4, 2026. Figures that change — fees, salaries, prices — are reviewed every six months; if something is out of date, tell us.
Where to go from here
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