The Space Shuttle Challenger O-ring failure is the example used to show how problems can be analyzed at different levels of detail and one cause can break into multiple causes.
How Weather Caused the Loss of the Space Shuttle Challenger
The Challenger Disaster: A Case of Subjective Engineering - IEEE
Challenger O-Ring Failure: Breaking One Cause Into Causes
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A Statistical Analysis of The Challenger Accident - NAS
How Did They Figure Out What Happened? The Iterative Analysis of a Complex Problem
The Space Shuttle Challenger Disaster –
O-Ring Failure
Space Shuttle Challenger O-Ring Failure Diagram
The Space Shuttle Challenger Explosion and the O-ring - Priceonomics
Untold: Challenger--The Real Story of an Avoidable Disaster
Challenger O-Ring Failure: Breaking One Cause Into Causes