Overview
Six Sigma is a quality improvement method, and no single body owns the qualification. This page covers the ASQ certifications, which are the most widely recognised exam-based route: Certified Six Sigma Green Belt (CSSGB) and Certified Six Sigma Black Belt (CSSBB). ASQ's pages could not be read directly, so the facts here come from reports of ASQ's published details. Confirm current figures on asq.org.
Levels or stages
Green Belt (CSSGB)
For people who work on improvement projects, often as part of a wider team. The exam is a single part with 110 questions, of which 100 are scored and 10 are unscored. ASQ suggests about three years of work experience in one or more areas of the Green Belt body of knowledge.
Black Belt (CSSBB)
For people who lead improvement projects. The exam is a single part with 165 questions, of which 150 are scored and 15 are unscored. Candidates need 3 years of on-the-job experience in one or more areas of the Black Belt body of knowledge and either one completed project with a signed affidavit or two completed projects with signed affidavits.
Exam pattern
| Item | Green Belt | Black Belt |
|---|---|---|
| Questions | 110 (100 scored) | 165 (150 scored) |
| Exam time | 4 hours 18 minutes | 4 hours 18 minutes |
| Total appointment | 4.5 hours | 4.5 hours |
Preparation tips
Study the ASQ body of knowledge for your level, since the questions follow it.
Practise statistics and process-control questions under timed conditions.
Is Six Sigma a single exam?
No. Several bodies offer belt levels. This page covers the ASQ Green Belt and Black Belt.
Does the Black Belt need project work?
Yes. ASQ requires one or two completed projects with signed affidavits, plus three years of experience.