Failed Lean Six Sigma Green Belt (IASSC ICGB)? Here's Your Recovery Plan

Pro tip: PeopleCert sells a Take 2 re-sit option that must be bought no later than 15 minutes before the first sitting and cannot be bought after a failure. A Take 2 re-sit must be scheduled and taken within six months of the initial exam, and failing to show up for a Take 2 appointment without rescheduling beforehand forfeits the voucher. A failed recertification attempt applies Elapsed status rather than revoking the certification, and the holder can re-establish Current status by passing the full certification exam again.

• Studying Lean tools and skipping the statistics because the credential is called Lean Six Sigma.
  The Analyze phase alone supplies about 20 questions and covers t-tests, ANOVA and seven non-parametric tests. Improve adds simple and multiple regression. Statistics carry about 40 of the 100 questions.
• Practising every calculation inside Minitab or SigmaXL.
  IASSC permits only a non-programmable four function or scientific calculator. Graphing calculators, programmable calculators, phone calculators and statistical software are barred. Rehearse the arithmetic the way you will do it on the day.
• Memorising which test to run without learning why the data type forces the choice.
  Build a decision tree with data type, number of samples and normality as the three branches. Exam items describe a situation and expect the test, so the tree is what gets scored, not the formula.
• Confusing Cp with Cpk and Pp with Ppk.
  Cp and Pp measure spread against the specification width and ignore centring. Cpk and Ppk penalise a process that is off centre. Cp uses within-subgroup variation, Pp uses overall variation. Work one example where Cp is 1.5 and Cpk is 0.8.
• Assuming a low p-value settles a business question.
  The Body of Knowledge names practical against statistical significance as a distinct topic. A statistically significant shift can be too small to fund, and exam scenarios test whether you can say so.
• Treating all control charts as interchangeable.
  Chart selection turns on data type and subgroup size. I-MR for individuals, Xbar-R for small subgroups, Xbar-S for larger subgroups, P and NP for defectives, U for defects per unit, CuSum and EWMA for small sustained shifts. The C chart is not in the IASSC Green Belt Body of Knowledge. Build a one-page selection table.
• Booking the exam expecting to be told a scaled score and a domain breakdown.
  IASSC publishes a single 70 percent minimum and does not publish a scaled score conversion or a result turnaround time on its certification pages. Plan around a flat percentage threshold, not a compensatory model.
• Letting the certification lapse because IASSC says recognition is perpetual.
  Recognition is perpetual but the status is not. Current status runs three years from the last day of the month of certification, then becomes Elapsed. The recertification exam must be taken no later than 90 days after that elapse date.
• Buying a training course before checking whether the provider is IASSC accredited.
  IASSC maintains a public directory of Accredited Providers whose curricula have been assessed against its Body of Knowledge. Training is optional, but a non-accredited course may be built against a different syllabus.
• Reading the ASQ Green Belt handbook and assuming it maps one to one.
  ASQ CSSGB is a separate credential with its own body of knowledge, a 110 question exam, a 483 USD fee and a three year work experience requirement. Tool mechanics overlap, but the topic list and the emphasis differ.

• 100 closed-book questions in 3 hours, 70% to pass
• Roughly 20 questions come from each DMAIC phase, so no phase can be skipped
• Analyze is the heaviest study load: t-tests, ANOVA, Mann-Whitney, Kruskal-Wallis, chi-squared
• A non-programmable four-function or scientific calculator is allowed, Minitab and phone calculators are not
• IASSC supplies a reference document as a download during exam startup, so learn where formulas sit in it
• Certification is recognised perpetually but drops to Elapsed status after 3 years without recertifying