- The exam has 110 multiple-choice questions (100 scored, 10 unscored) plus a performance-based assessment, delivered only at Prometric test centers.
- Advanced Data Management and Analytic Methods carries 25% of the 100 scored MCQs, the largest single domain.
- A scaled score of 550 out of 750 passes; it is not a raw percentage.
- Eligibility requires current ASQ CSSBB plus experience, and an evidenced portfolio with minimums in three categories.
Which MBB This Cheat Sheet Covers
The acronym "MBB" is shared by several unrelated credentials and industries. This page covers exactly one: the Certified Master Black Belt (CMBB) from the American Society for Quality (ASQ). If you are weighing the credential itself, the overview of MBB certification and the explainer on what MBB stands for are good companions to this one-pager.
Everything below is a compressed reference. Where a number is not officially published, this sheet says so rather than guessing. For deeper dives, follow the links in each section, and test yourself on the MBB practice test once you have skimmed the essentials.
Exam Format at a Glance
| Item | What to Know |
|---|---|
| Certifying body | American Society for Quality (ASQ) |
| Designation | Certified Master Black Belt (CMBB) |
| Delivery | Computer-based testing at Prometric physical centers only; no remote proctoring, no paper-based option |
| Question count | 110 multiple-choice questions (100 scored + 10 unscored) plus a performance-based assessment |
| Performance tasks | Number of tasks is not published |
| Time | Live exam limit of 320 minutes with a 330-minute appointment; the brochure says 318 minutes, so confirm when booking |
| Language | English |
| References | Open book, with securely bound references |
| Calculator | Nonprogrammable calculator permitted |
| Passing score | 550 on a 750 scaled range |
| Body of Knowledge | Current linked BoK is the 2018 version |
The open-book rule is easy to misread as an easy-exam signal. Questions at the Master Black Belt level test judgment about deployment, portfolio decisions, and advanced analytics. A bound reference helps you verify a formula or definition, but it will not make a scenario decision for you. For a realistic read on difficulty, see how hard the MBB exam is.
Eligibility and the Portfolio
The MBB is a senior credential, and the gate reflects that. You need a current ASQ Certified Six Sigma Black Belt (CSSBB) credential, plus one of the following experience paths:
- Five years of experience as a Six Sigma Black Belt or Master Black Belt, or
- Ten completed Six Sigma Black Belt projects.
You also submit an approved, evidenced portfolio with category minimums:
| Portfolio Category | Minimum Items |
|---|---|
| Teaching, coaching, or mentoring | 10 |
| Occupational experience | 6 |
| Technical experience or innovation | 5 |
No separate required degree or course-hour minimum was verified in the sources used for this sheet, so do not assume one exists, and do not assume one does not; check the current ASQ application materials. The practical lesson is that the portfolio is evidence-driven. Start collecting artifacts (project charters, mentoring records, training materials, innovation write-ups) well before you apply. The full prerequisites breakdown lives in MBB requirements: eligibility, prerequisites and how to qualify.
The Money Math
The fee structure has two parts: a portfolio fee and an exam fee. Both are paid, and member status changes both.
| Fee Component | ASQ Member | Nonmember |
|---|---|---|
| Portfolio fee | $700 | $800 |
| Exam fee | $1,499 | $1,599 |
| Total | $2,199 | $2,399 |
The member total is quoted before membership dues, so factor that in when comparing. A retake costs $1,399. Given those numbers, a failed attempt is expensive, which is a strong argument for investing in preparation up front. The complete cost picture, including what is and is not included, is in the MBB certification cost breakdown, and whether the spend pays off is examined in is the MBB certification worth it.
Domain Map and Weights
The Body of Knowledge has six domains. The weights below apply only to the 100 scored multiple-choice questions. Weights for the full exam including the performance-based assessment are not published, so do not treat these percentages as your total grade.
| Domain | Weight (scored MCQs) |
|---|---|
| 1. Enterprise-wide Planning | 20% |
| 2. Organizational Competencies for Deployment | 20% |
| 3. Project Portfolio Management | 15% |
| 4. Training Design and Delivery | 10% |
| 5. Coaching and Mentoring Responsibilities | 10% |
| 6. Advanced Data Management and Analytic Methods | 25% |
Notice the split. Domains 1 through 3 (55% combined) are about running a Six Sigma program at the enterprise level. Domains 4 and 5 (20% combined) are about developing people. Domain 6 (25%) is the technical heavyweight. A candidate who is strong on analytics but thin on deployment strategy, or the reverse, will leave points on the table. The full treatment is in the complete guide to all six MBB content areas.
Must-Know Topics by Domain
The Body of Knowledge expects a Master Black Belt to think like a program leader, not a project executor. Use these blocks as a self-check: if you cannot explain each point in your own words, that is a gap to close.
Enterprise-wide Planning (20%)
Enterprise-wide Planning
This domain is about aligning Six Sigma with organizational strategy rather than running isolated projects.
- How improvement initiatives connect to strategic objectives and business priorities
- Selecting and sequencing initiatives so the program supports enterprise goals
- Building the business case and communicating value to executive sponsors
- Understanding where Six Sigma fits alongside other improvement approaches in an organization
Organizational Competencies for Deployment (20%)
Organizational Competencies for Deployment
Here the exam tests whether you can build and sustain the capability a deployment needs.
- Defining roles, responsibilities, and governance for a Six Sigma deployment
- Change management, stakeholder resistance, and sustaining gains after projects close
- Assessing organizational readiness and deployment maturity
- Leadership behaviors and communication that keep a program funded and credible
Project Portfolio Management (15%)
Project Portfolio Management
The unit of analysis shifts from a single project to the whole pipeline of projects.
- Prioritizing and selecting projects against business impact and resource constraints
- Tracking portfolio performance and benefits realization across many projects
- Resource allocation and balancing the portfolio over time
- Deciding when to stop, rescue, or redirect underperforming projects
Training Design and Delivery (10%)
Training Design and Delivery
A Master Black Belt is expected to build belts, which means designing instruction that works.
- Needs analysis and curriculum design for different belt levels
- Delivery methods and adult learning principles
- Evaluating training effectiveness, not just attendance
Coaching and Mentoring Responsibilities (10%)
Coaching and Mentoring Responsibilities
This domain mirrors the teaching, coaching, and mentoring emphasis in the portfolio requirements.
- Coaching Black Belts and Green Belts through project obstacles
- Reviewing projects and giving constructive, actionable feedback
- Developing project leaders and building a sustainable pipeline of talent
Advanced Data Management and Analytic Methods (25%)
Advanced Data Management and Analytic Methods
The largest domain, and the one where technical depth is tested hardest.
- Data quality, measurement system considerations, and data management practices
- Advanced statistical and analytic methods used to model, predict, and optimize processes
- Choosing the right method for a described business situation and interpreting results correctly
- Knowing which formulas and tables to flag in your bound references
Scoring, Pass Rates and Results Timing
The passing standard is a scaled score of 550 out of 750. Scaled scoring means you cannot convert this into "I need X% of questions right." Do not memorize a raw-percentage target; it does not exist in the sources. The mechanics are covered in MBB passing score: exactly what you need to pass.
Official ASQ pass rates for the CMBB are:
| Year | Official Pass Rate |
|---|---|
| 2024 | 89% |
| 2023 | 76% |
| 2022 | 65% |
Treat these with care. They swing noticeably from year to year, which means a single figure is a poor predictor of your own odds. No verified 2025 or 2026 rate and no first-attempt rate was available. Candidates are also a self-selected group: you must already hold CSSBB and a substantial experience record to sit the exam. For context and caveats, read MBB pass rate: what the data shows.
Results timing is inconsistent in the source material. Generic ASQ result-time text conflicts with the MBB-specific FAQ, which indicates approximately four weeks. Plan around the MBB-specific figure, but do not make irreversible commitments, such as a start date for a new role tied to the credential, based on a result date you have not confirmed.
Exam-Day Logistics
- Book at Prometric. The exam is delivered only at physical Prometric centers. Remote proctoring and paper delivery are not offered.
- Confirm the time limit when you schedule. The live exam shows 320 minutes with a 330-minute appointment, while the brochure says 318. Verify what your booking confirmation states.
- Prepare your references. The exam is open book, but only securely bound references are allowed. Loose pages or unbound notes are the kind of thing to check against the current policy before test day.
- Bring an approved calculator. A nonprogrammable calculator is permitted; verify your model complies.
- Pace across both parts. Because the performance assessment is not extra time, budget the clock for the 110 multiple-choice questions and the performance work together.
Scheduling windows and deadlines change, so check MBB exam dates, testing windows and scheduling before you commit to a plan.
Staying Certified
The certification runs on a three-year cycle. You can recertify in two ways:
- Journal recertification: earn 18 recertification units (RUs) and pay the fee, which is $120 for members or $160 for nonmembers.
- Re-examination: sit the exam again.
One caution: RUs are not hours. Do not assume a fixed hours-to-RU conversion; confirm how a given activity is credited before you rely on it. If you plan a long career in program leadership, the recertification cost is part of the lifetime price of the credential. See the MBB salary guide and MBB jobs overview for how the credential tends to show up in senior continuous-improvement and deployment roles.
A Domain-Driven Study Sequence
Generic study advice matters less here than sequencing by domain. The sequence below is tied to the weights and the nature of each domain. For a fuller plan, see the MBB study guide.
Domain 6 first
- Largest weight at 25%, and the most technical, so it benefits from the longest runway
- Build a tabbed, securely bound reference of formulas and method-selection notes as you go
Domains 1 and 2
- Together 40% of scored questions; study strategy and deployment as one connected story
- Practice scenario questions that ask what a program leader should do next
Domain 3
- Portfolio prioritization and benefits tracking, building on the strategy work
Domains 4 and 5
- Training and coaching, 20% combined; draw on your portfolio evidence for real examples
Integration and timing
- Full-length practice under a single shared clock, including performance-style practice
- Final audit of your bound references
Key Takeaway
Because the six weights apply only to the 100 scored multiple-choice questions, treat them as a guide to where to spend study hours, not as a prediction of your total score. The performance-based assessment is a separate skill to rehearse, so reserve time for it rather than assuming domain knowledge alone will carry you.
Once your notes are in order, pressure-test them on the MBB practice exams, and revisit the overview posts, such as MBB certification and MBB training, if any part of the credential's scope is still unclear.
Frequently Asked Questions
There are 110 multiple-choice questions, of which 100 are scored and 10 are unscored, plus a performance-based assessment. The number of performance tasks is not published.
The live exam limit is 320 minutes with a 330-minute appointment, though the brochure lists 318 minutes. Confirm the figure on your booking. The performance portion is not additional time beyond the total.
A scaled score of 550 out of 750. This is a scaled score, not a raw percentage, so there is no fixed number of questions you must answer correctly.
No. The exam is delivered only at Prometric physical test centers. Neither remote proctoring nor paper-based delivery is available.
For nonmembers, the portfolio fee of $800 plus the exam fee of $1,599 totals $2,399. For members, $700 plus $1,499 totals $2,199, before membership dues. A retake costs $1,399.
Certification runs on a three-year cycle. You can recertify through journal recertification with 18 RUs and a fee of $120 for members or $160 for nonmembers, or by re-examination. RUs are not the same as hours.