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Original SixSigmaKaizen Content
Why 5-Why Analyses Fail
A first-party SixSigmaKaizen video lesson on the common ways 5-Why investigations break down, and what teams should do instead when they need a defensible root cause.
About This Original Video
This video was created by SixSigmaKaizen to support practical root cause analysis, not to present 5-Why as a magic worksheet. The point is straightforward: a 5-Why chain only helps when each answer is tied to evidence from the process and when the team is willing to challenge weak assumptions.
Use it as a short training lesson before a problem-solving meeting, corrective-action review, Kaizen event, or supervisor coaching session. It pairs well with the site's 5-Why guide, online tool, and Excel template.
What the Lesson Emphasizes
Evidence Over Guessing
A 5-Why analysis fails when answers are plausible but unverified. Each link in the chain needs evidence from the real process.
Process Observation
The team should look at the work, records, conditions, and handoffs before locking in a root cause statement.
Better Facilitation
Strong facilitation keeps the team from stopping at blame, training gaps, or vague human error explanations.
Actionable Root Cause
The final answer should explain the failure mechanism clearly enough that a corrective action can be tested.
Use These Resources With the Video
Read the 5-Why Root Cause Guide
Use the guide for deeper facilitation standards, evidence expectations, examples, and common failure modes.
Use the Online 5-Why Tool
Build a structured why chain from a problem statement and mark the likely root cause after review.
Download the 5-Why Template
Use the Excel workbook when your team needs a reusable worksheet and summary register.
Visit the Root Cause Hub
Connect 5-Why with Fishbone, Pareto, 8D, CAPA, and other root cause methods.
Video Frequently Asked Questions
Who created this video?
This is original content created by SixSigmaKaizen for manufacturing, quality, and continuous-improvement practitioners.
What does the video teach?
It explains why 5-Why analyses often fail, including weak evidence, skipped process observation, shallow questioning, political answers, and corrective actions that do not address root cause.
What should I use with this video?
Use the 5-Why guide, online 5-Why root cause tool, and Lean 5-Why template to turn the lesson into a structured investigation workflow.