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.
Shuttle Challenger Exploded Thirty Years Ago Today
Space Shuttle Challenger O-Ring Failure Diagram
Defrosting the Challenger O-rings
IBIS-based root cause analysis of the Space Shuttle Challenger
What caused the big explosion on the shuttle Challenger? - Quora
Space shuttle challenger explosion hi-res stock photography and
Space Shuttle Challenger O-Ring Failure Diagram
Challenger space-shuttle-incident
Challenger Explosion Cause : Applying Data Science to the Challenger!
NASA Views Images, Confirms Discovery of Shuttle Challenger
Space Shuttle Challenger Disaster Oral History
Ask Us - Space Shuttle Challenger Disaster
Viewpoint: Challenger and the misunderstanding of risk - BBC News