5 Why

5 Why, also know as 5 Why Analysis or Root Cause Analysis, is the Japanese problem-solving technique to determine the root cause or source of the problem.

It is based on the concept of treating the root causes and not just the symptoms of the problem.

This technique helps identify the underlying the root cause of the problem by repeatedly asking “Why” at least five times. Hence the name 5 Why. Although you can continue asking more Why questions till you get to the root cause or stop before five if you arrive at the root cause.

Each of the Why questions the answer from the previous Why and try to get to the next level causes. A single problem can have multiple causes and the 5 Why analysis will follow each of these cause by further drilling down each such cause by asking Why. When used correctly, 5 Why analysis helps you to identify and fix the real reasons behind a problem and eliminate them from the root.

By the way, do check out the Certified Lean Six Sigma Black Belt Handbook – it is one of the most essential guide for anyone trying to get certified as LSS Black belt or in general wants to understand LSS and improve processes. – check it out here.

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Sachin Naik

Passionate about improving processes and systems | Lean Six Sigma practitioner, trainer and coach for 14+ years consulting giant corporations and fortune 500 companies on Operational Excellence | Start-up enthusiast | Change Management and Design Thinking student | Love to ride and drive