Root Cause Analysis

Free 5 Whys
Root Cause Analysis

Stop fixing symptoms. Find the real cause.

The 5 Whys method helps lean teams and quality engineers drill down to the root of any problem — in minutes, not meetings.

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Every RCA Tool You Need

Five proven root cause analysis frameworks, all free, all in your browser. No spreadsheets, no plugins.

Most Popular
5 Whys Analysis
Step-by-step guided root cause analysis. Built-in validation, expert tips, and PNG export.
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Fishbone Diagram Maker
Create Ishikawa cause-and-effect diagrams with 6M, 6P, or custom categories. Visual builder with PNG export.
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Pareto Chart Maker
Apply the 80/20 rule to identify which causes matter most. Automatic cumulative line and PNG export.
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FMEA / RPN Calculator
Calculate Risk Priority Numbers to prioritize failure modes. Color-coded severity matrix.
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8D Report Generator
Generate structured 8D problem-solving reports covering D0–D8 disciplines with integrated 5 Whys.
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How It Works

The 5 Whys Process

A repeatable five-step framework used by Toyota, lean manufacturers, and software teams worldwide.

1
State the Problem
Write a clear, factual problem statement. Avoid assumptions — describe what you observe.
2
Ask Why #1
Ask why the problem occurs. Write the first direct cause. Keep it factual and specific.
3
Continue to Why #5
Each answer becomes the input to the next why. Dig past symptoms to the systemic root.
4
Validate the Chain
Read back from root cause to problem. If the logic holds, you have your answer.
5
Assign Countermeasures
Map corrective actions to root causes. Assign owners and deadlines before you close.
Knowledge Base

Learn Root Cause Analysis

Practical guides, templates, and real-world examples for quality engineers and lean practitioners.

April 2026 10 min read
8D Report Examples: 5 Real Case Studies
Automotive, aerospace, medical devices, food processing, and electronics — every discipline D0 through D8 filled in.
Read article
April 2026 12 min read
5 Whys Examples: 10 Real-World Case Studies
Manufacturing, IT, healthcare, e-commerce, and more. Each case study walks through a full causal chain.
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April 2026 14 min read
Root Cause Analysis: A Complete Guide for Teams
The 6-step RCA process, five methods compared, and how to turn findings into lasting fixes.
Read article
View all articles →
What Teams Say

Used by Quality Teams Worldwide

We cut repeat defects by 40% in 3 months after running 5 Whys on every escaped bug. This tool made it easy to document and share.

Sarah K.
Quality Engineering Lead — Automotive Tier 1

Finally a clean, no-login tool that actually exports a professional PDF. Our clients love seeing the structured analysis.

Marcus T.
Operations Consultant — Independent

I run a weekly RCA session with my team using the 5 Whys tool. The workflow keeps everyone focused on causes, not blame.

Priya R.
Plant Manager — Medical Devices

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