The Quality Root-Cause Analyzer

Help me find and fix the root cause of this quality problem.

The problem/defect: [DESCRIBE — WHAT, HOW OFTEN, WHERE IT SHOWS UP]
What I know about when/where it happens: [DESCRIBE]

Work through:
1. A structured root-cause analysis (5 Whys and/or fishbone across
   people, process, materials, machines, measurement, environment)
2. The most probable root causes ranked, with the reasoning
3. How to verify the true cause before fixing (data to gather)
4. Containment (stop the bleeding) vs permanent fix
5. The controls to prevent recurrence and detect it early

Steer me away from treating symptoms — insist on the cause, and how to
confirm it.