A one-page Lean Six Sigma Black Belt reference: exam facts plus the DMAIC tools and advanced statistics you must know. Use it for final review. Confirm all current details on the IASSC certification page.
Exam facts
| Item | Detail |
|---|---|
| Questions | 150 (closed book; some forms add unscored) |
| Time | 4 hours |
| Pass mark | 70% minimum |
| Cost | ~US$450 (approximate; confirm with IASSC) |
| Prerequisites | None (Green Belt not required) |
| Body | IASSC (vendor-neutral; others like ASQ differ) |
DMAIC and key tools by phase
- Define - project charter, voice of the customer (VoC), CTQ tree, SIPOC; scoping and leading larger projects.
- Measure - process map, data types, measurement-system analysis (MSA), process capability (Cp, Cpk).
- Analyze - root-cause tools (fishbone, 5 Whys, Pareto), hypothesis testing for different data types (including non-normal), ANOVA-style group comparisons, correlation.
- Improve - multiple regression, design of experiments (DOE), solution selection, piloting, FMEA, mistake-proofing (poka-yoke).
- Control - control plan, statistical process control (SPC) charts, standard work.
Where Black Belt goes beyond Green Belt
- Inferential statistics - choose and interpret the right hypothesis test for the data, including non-normal cases and group comparisons.
- Multiple regression - model an output from several inputs, not just one.
- Design of experiments (DOE) - study several factors at once instead of one-factor-at-a-time.
- Leadership scope - lead larger projects full-time and coach Green Belts.
Core concepts
- Variation - Six Sigma reduces process variation and defects using data.
- Defect / DPMO - a defect fails a CTQ; DPMO measures defects per million opportunities.
- Type I / Type II error - rejecting a true null, or failing to reject a false null - core to hypothesis testing.
- Black Belt role - leads larger projects full-time and coaches Green Belts.
Common traps
- Treating it as a longer Green Belt - the Analyze and Improve statistics go much deeper.
- Skipping design of experiments (DOE) and multiple regression, which are core Black Belt content.
- Learning tools in isolation instead of by DMAIC phase and data type.
- Confusing the IASSC route with ASQ’s - they are different bodies.