ICGB
IASSC Green Belt Complete Review Guide 2026–2027
Every exam topic in a 30-page Arabic PDF, ordered from the heaviest unit to the lightest. The first three chapters alone cover about 73% of the exam questions.
- 30Pages
- 60Key points
- 34Common mistakes
- 49Flashcards
Guide map
Each chapter is one exam unit, ordered by its weight in the real exam.
| Chapter | Unit | Weight | Exam questions | Key points |
|---|---|---|---|---|
| 1 | Measure Phase | 32% | 32 | 13 |
| 2 | Analyze Phase | 22% | 22 | 12 |
| 3 | Define Phase | 19% | 19 | 13 |
| 4 | Control Phase | 19% | 19 | 12 |
| 5 | Improve Phase | 8% | 8 | 10 |
Chapter 1 in full: Measure Phase
32% of the exam, about 32 questions. These are its key points, as in the guide.
- A fishbone shows possible causes but does not prove which are true; the problem goes at the head of the fish.
- An FMEA is updated whenever the process or the failure information changes.
- In s = √[Σ(x − x̄)² ÷ (n − 1)], the sample formula divides by n − 1.
The rest of chapter 1, on this page
- In a normal distribution about 68% lies within ±1σ, 95% within ±2σ and 99.7% within ±3σ, and the mean, median and mode are equal.
- Z = (x − μ) ÷ σ. Example: with μ = 100 and σ = 5, the value 112 sits at Z = 2.4.
- A normality p-value below α means normality is rejected; with very large samples tiny departures become significant, so judge with the plots too.
- Bias = average reading − reference value; linearity is how bias changes over the operating range; stability is how it changes over time.
- A common guide for %GRR: under 10% acceptable, 10% to 30% marginal, over 30% unacceptable; ndc should be 5 or more.
- A gauge's resolution should be about one-tenth of the tolerance or spread.
- In a destructive test a part cannot be measured twice, so a nested study replaces the crossed study.
- Cp = (USL − LSL) ÷ 6σ and Cpk = the smaller of (USL − μ) ÷ 3σ and (μ − LSL) ÷ 3σ. Example: USL = 10.6, LSL = 9.4, σ = 0.15, μ = 10.1 gives Cp ≈ 1.33 and Cpk ≈ 1.11.
- Cp and Cpk use short-term (within-subgroup) variation; Pp and Ppk use the overall standard deviation.
- Attribute capability is expressed as average proportion defective or DPMO, then as a sigma level.
Common mistakes in this chapter
- Reading the Detection scale backwards: a 10 means the failure is almost certain to go undetected, not that it is easy to catch.
- Thinking an added inspection lowers Occurrence; inspection improves Detection, while preventing the cause (such as an interlock) lowers Occurrence.
- Confusing accuracy with precision: readings that cluster tightly away from the reference are precise but not accurate.
- Confusing %Study Variation with %Tolerance: the first judges the gauge for process improvement, the second for accept/reject decisions against the specification.
- Calculating Cpk for an unstable process; the result does not predict performance.
- Thinking Cp is enough: Cp ignores centring, and Cpk is never larger than Cp.
- Reading the box in a box plot as the mean ± one standard deviation; it is the middle 50%, from Q1 to Q3.
The other chapters are in the full guide
One purchase · lifetime access · review guide included
7-day review plan
The chapters are spread over 6 days by weight so each day carries a similar load. Day 7 is a full exam.
Day 1 · 32% of the exam
Chapter 1: Measure Phase
Day 2 · 22% of the exam
Chapter 2: Analyze Phase
Day 3 · 19% of the exam
Chapter 3: Define Phase
Day 4 · 19% of the exam
Chapter 4: Control Phase
Day 5 · 8% of the exam
Chapter 5: Improve Phase
Day 6
Full mock exam: 100 questions in 180 minutes, then review the common mistakes in the units where you lost marks.
How many correct answers do you need?
- Pass mark 70%70 correct out of 100
Before you read: see your score today
10 free questions from the main units, no sign-up. Then you know which chapter to start with.
Try 10 free questions and see your levelA look at each chapter
The first three key points of each chapter, as they appear in the guide (in Arabic in the PDF).
Chapter 1: Measure Phase
- A fishbone shows possible causes but does not prove which are true; the problem…
- An FMEA is updated whenever the process or the failure information changes.
- In s = √[Σ(x − x̄)² ÷ (n − 1)], the sample formula divides…
Chapter 2: Analyze Phase
- Statistical inference is drawing conclusions about a population from a sample.
- Two random samples from the same process usually give different means because of sampling…
- As n grows, the distribution of sample means tends toward normal even when the…
Chapter 3: Define Phase
- DMAIC has five phases
- With the 1.5 sigma shift
- DPU = defects ÷ units. Example
Chapter 4: Control Phase
- I-MR for one reading per period, Xbar-R for small subgroups, and Xbar-S for larger…
- P for the proportion defective, NP for the number defective with a constant n…
- Xbar limits
Chapter 5: Improve Phase
- r = +1 is a perfect positive straight-line relationship, r = −1 a perfect…
- In simple regression R² = r². Example
- Worked example
The full guide comes with lifetime access
The full guide (30 pages) is included with lifetime access to this exam, together with every question and full mock exam. Chapter 1 is free for everyone.
Questions about the guide
Is the guide free?
Chapter 1 is free to read on the guide page. The full guide comes with lifetime access to this exam; 7-day access does not include it.
Is it up to date for 2026–2027?
Yes. Unit weights and exam facts follow what the exam body last published, and the last check date is printed in the guide. If the standards change we update the file and buyers download the new version.
Does the guide have questions?
No. The guide covers key points and common mistakes; scoring, weak-area practice and full mock exams are on the site.
Can I read it on my phone?
Yes. A5 pages in a single column, with chapters linked from the contents.
- Pages
- 30
- Edition
- 1448 AH · 2026–2027
- Language
- Arabic
- Last updated
Buy this exam
Pick the access that lasts until your test date.
Included
- Full mock exams: 100 questions in 180 minutes, with a score for every unit
- 577 questions, every option explained with its source
- Practice that starts with your weakest units, plus a review of your mistakes
- Complete Review Guide 2026–2027 (PDF), with lifetime access only
Continue with your Google account and you go straight to the payment page.
You pay on the Waffo Pancake checkout page (in English). The amount is in US dollars and your bank converts it to riyals. One payment with no automatic renewal, by Visa, Mastercard (a mada card with either logo works too), Apple Pay or Google Pay. Your statement shows "WAFFO". Purchases are not refundable.