The meta-library: methods, comparisons, and frameworks.
This is the category-agnostic shelf — the pillar guide that covers the core RCA methods, the side-by-side comparisons for picking between them, the adjacent frameworks (PDCA, CAP, Fault Tree, 8D), and the fundamentals that every good analysis rests on (problem statements, corrective actions, curated reading).
Most RCA writing on the internet picks one method (usually 5 Whys) and pretends the others don’t exist. In practice, no single method survives every problem — you pick based on whether you need depth or breadth, reactive or proactive work, qualitative or data-driven prioritisation, and whether a regulator will read the output.
This category holds the cross-cutting material: a pillar guide that walks through the 6-step RCA process and the five major methods; seven head-to-head comparisons; adjacent frameworks like PDCA and Fault Tree Analysis; and the two fundamentals that quietly determine whether any RCA works — a sharp problem statement and a corrective-action plan that actually ships.
If you’re choosing which method to use, start with the tools comparison. If you want the full playbook, read the complete guide.
25 articles on the practice of RCA
Grouped by purpose: the pillar guide and comparisons at the top, adjacent frameworks in the middle, fundamentals and reading at the end.
Root Cause Analysis: The Complete Guide
What RCA is, the 6-step process, five methods compared, and how to turn findings into lasting fixes that actually ship.
ComparisonRCA Tools Comparison: 5 Methods Side by Side
5 Whys, Fishbone, Pareto, FMEA, Fault Tree — inputs, outputs, time cost, team size, regulatory fit. A3 and 8D covered in their own filars.
Comparison5 Whys vs Fishbone: When to Use Which
Depth vs breadth, qualitative vs structured. Decision matrix and the common mistake of picking the wrong one.
Comparison5 Whys vs Pareto Analysis: Qualitative vs Data-Driven
When a hunch beats a chart, when a chart beats a hunch, and how to run them together.
ComparisonFishbone vs Fault Tree Analysis: When to Use Which
Qualitative brainstorm vs quantitative top-down probability tree. Safety-critical vs process-improvement contexts.
ComparisonPareto vs Fishbone: Prioritize First or Explore First?
Data-driven prioritisation vs qualitative cause-mapping. Why most investigations use both, and the two mistakes that chase the wrong cause.
ComparisonFishbone vs FMEA: Investigate Backward or Prevent Forward?
Reactive cause-mapping vs proactive, RPN-scored risk assessment. When each fits and why a fishbone often feeds an FMEA.
ComparisonFMEA vs Fault Tree Analysis: Bottom-Up or Top-Down?
Inductive risk screening vs deductive probability logic. Why safety-critical programs run both, and where RPN misses combinations.
TemplateRoot Cause Analysis Template — Free Excel, Word & PDF
Method-agnostic seven-section RCA report: problem statement, evidence, why-chain, verified root cause, corrective actions. Direct download.
ExamplesRoot Cause Analysis Examples: 5 Real-World Cases
Manufacturing, healthcare, software, logistics, customer service — each solved with a different method, with real numbers and verified fixes.
MethodFault Tree Analysis: Top-Down Logic for Safety Critical
Boolean gate logic, cut sets, and probability calculation for aerospace, nuclear, and medical-device applications.
MethodPDCA Cycle: Plan-Do-Check-Act in Practice
Deming's four-phase improvement loop, how it wraps any RCA method, and the trap of skipping Check.
TemplateSIPOC Template — Free Excel, Word & PDF
Scope a process before anyone analyses it: the five columns, the middle-out fill order (P → O → C → I → S), boundaries, and the output-requirements sheet most SIPOCs skip.
FundamentalsHow to Write a Problem Statement That Actually Works
The 5W+1H frame, what to strip out, and why vague problem statements doom every RCA that follows.
ClosureCorrective Action Plan: How to Turn Findings Into Fixes
The CAP template, SMART actions, verification vs validation, and how most corrective actions die before they ship.
TemplateCAPA Process Under the FDA QMSR + Free CAPA Form
What changed on 2 February 2026, the correction / corrective / preventive distinctions that show up in findings, and a nine-section CAPA form in Excel, Word and PDF.
Follow-throughCorrective Action Tracking: Why RCA Fixes Stall
The ninety days after the analysis: five ways actions stall, what a trackable action looks like, the 3/7/30 review cadence, and where teams actually track them.
TemplateBlameless Postmortem Template — Free Excel, Word & PDF
The nine-section incident record: timeline where every entry names its source, contributing factors instead of one root cause, and actions typed prevent / detect / mitigate.
FacilitationHow to Run a Kaizen Event — Free Agenda & Role Card
The five-day structure with a gate before each day ends, who has to be in the room, the pre-work that decides the week, and the Day 30 verification most teams skip.
TemplateOEE Calculation: Formula, Worked Example and Template
Availability, performance and quality with an example you can check line by line, the six big losses, why 85% is misused, and a free Excel template with live formulas.
ChecklistPPAP Checklist: All 18 Elements and 5 Submission Levels
What each element must contain and where it usually fails, the order to build the file in, the triggers for a new submission, the Ppk and Gage R&R numbers a reviewer checks, and a free checklist.
AgendaRoot Cause Analysis Meeting Agenda (60 and 90 Minutes)
Who belongs in the room by relationship to the problem, both agendas block by block with the output each one must produce, the six-line pre-read, and a free template in Excel, Word and PDF.
FacilitationHow to Facilitate an RCA Workshop (1h / 4h / 8h Formats)
Method selection, three workshop format agendas, eight facilitation pitfalls and how to recover from each, and the post-workshop follow-up that closes the loop.
ReadingRecommended Books on RCA, Quality & Problem-Solving
Twenty-three curated titles by Ishikawa, Deming, Ohno, Tague, and others. Every book has been used in actual practice.
ReadingThe 10 Best Lean Six Sigma Books for 2026
Tighter, LSS-specific shortlist for certification candidates and deployment leaders. Field reference, Toyota foundations, and a few outside-the-canon picks.
Before you pick a method
What is root cause analysis, in one sentence?
RCA is the practice of finding the systemic cause of a problem — not the first plausible answer, not the individual who happened to be on shift, and not the symptom — so that a corrective action can prevent recurrence rather than just suppress this instance. The complete guide walks through the full 6-step process.
Which RCA method should I pick?
Depends on three questions: Is the failure known or hypothetical? Do you have data or only opinions? Do you need regulatory defensibility? See the tools comparison for the decision matrix — it covers all five methods side by side on inputs, outputs, time cost, team size, and regulatory fit.
Can I combine methods in a single investigation?
Yes, and usually you should. Common pairings: Fishbone + 5 Whys (map breadth, drill depth), Pareto + 5 Whys (rank, then investigate), FMEA + Corrective Action Plan (score, then act). Running any single method in isolation is the most common source of shallow RCA output.
Where does PDCA fit relative to RCA?
PDCA is the outer loop — Plan-Do-Check-Act is the improvement cycle that contains your RCA. RCA sits inside the Plan phase. Check is where you verify that the corrective action from your RCA actually reduced the problem (this is the step most teams skip). See the PDCA article for the detailed workflow.
What separates a good corrective action from a bad one?
SMART (specific, measurable, assigned, relevant, time-bound) + a verification step + a systemic target (process change, not “remind people to be careful”). Most corrective actions die because they have none of these. The Corrective Action Plan article walks through the template.
What should I read to go deeper?
The recommended books list covers 23 curated titles: Ishikawa, Deming, Ohno, Tague, Roser, and others. Every book has been used in actual consulting practice — no one-star Amazon listicles.
Pick a tool, run an analysis, find the real cause
Three guided RCA tools, no signup, no tracking, nothing leaves your browser. Start with 5 Whys if the cause is known, Fishbone if it isn’t, Pareto if you have the data.