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.
Case Details > Explosion of the Space Shuttle Challenger
What caused the Space Shuttle Challenger Disaster?
NASA Views Images, Confirms Discovery of Shuttle Challenger
A Statistical Analysis of The Challenger Accident - NAS
Challenger Explosion ThinkReliability, Case Studies
How Weather Caused the Loss of the Space Shuttle Challenger
Historic front page news: In 1986, the world reacted in horror as
IBIS-based root cause analysis of the Space Shuttle Challenger
Challenger: A Management Failure –
The Space Shuttle Challenger Disaster: What Happened? (Infographic
Rogers Commission Report - Wikipedia
How Did They Figure Out What Happened? The Iterative Analysis of a Complex Problem
The Space Shuttle Challenger Disaster: The History and Legacy of
How Did They Figure Out What Happened? The Iterative Analysis of a Complex Problem