Root Cause, Risk, and FMEA
Root-cause drills test Pareto, fishbone, 5 Whys, cause validation, FMEA, risk priority, mistake-proofing logic, and prevention of false conclusions.
How to study for Six Sigma Black Belt
Use DMAIC as the map, then add Black Belt depth: leadership, financial impact, advanced statistics, experimental design, change management, and sustained control.
Core concepts
Concept 1
Root Cause, Risk, and FMEA questions reward the answer that follows the official source, the professional role, and the stated facts.
Exam cue: Identify the candidate role, client or public risk, source rule, calculation, or process step being tested.
Concept 2
The strongest answer identifies the rule, safety concern, ethical duty, calculation, client factor, or process step before acting.
Exam cue: Check whether the fact pattern is using a national standard, jurisdiction rule, handbook policy, or scenario-specific instruction.
Concept 3
Eliminate answers that ignore requirements, skip documentation, overreach the role, or treat convenience as the standard.
Exam cue: Choose the compliant and professionally scoped answer before the convenient or familiar answer.
Risk pitfalls and guardrails
Treating related standards as interchangeable without checking the source.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Skipping screening, documentation, authorization, sanitation, recordkeeping, or other required procedure.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Choosing an answer that protects convenience instead of client safety, public protection, or the stated professional duty.
Guardrail: Avoid answers that rely only on habit, ignore the stated source, skip safety or compliance steps, or choose convenience over the professional standard.
Memory anchors
Pareto
A Pareto chart highlights the few categories contributing the largest share of a problem.
Fishbone
A fishbone diagram organizes possible causes into logical categories.
5 Whys
5 Whys pushes beyond symptoms toward an actionable root cause.
Cause Validation
Cause validation uses data or experiment to test whether a suspected cause matters.
FMEA
FMEA identifies failure modes, effects, causes, controls, and improvement actions.
Severity
Severity rates the seriousness of the failure effect.
Occurrence
Occurrence rates how likely the cause or failure is to happen.
Detection
Detection rates how likely current controls are to detect the failure before impact.
Risk Priority
Risk priority helps rank failure modes for action, but judgment still matters.
False Cause
A false cause occurs when the team accepts association or opinion as proof.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A defect Pareto shows labeling errors 38%, seal leaks 31%, contamination 19%, and all other categories 12%. What is the best use of this result?
A fishbone session identifies “new operator” as a possible cause of packing errors. What should the team do before designing retraining?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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