
The 5 Whys is a root cause analysis technique that follows a problem through successive “why?” questions until the team reaches an evidence-supported cause it can act on. Five is a useful rule of thumb, not a quota: some investigations stop sooner, while others branch or need a broader method.
This guide explains the technique, walks through a practical example, and shows how to turn the result into a corrective action. You can also use the free Process Street 5 Whys template to record evidence, assign owners, approve countermeasures, and verify that the fix worked.
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