# Fishbone Diagram
- aka _Ishikawa diagram_ or cause-and-effect diagram
- Developed by Japanese organizational theorist Kaoru Ishikawa in the 1960s to
measure quality control processes in the shipbuilding industry.
- Analyze what is the _root cause_ of a problem
- 5 major contributors to variation
- People
- Machines
- Materials
- Methods
- Mother nature (environment)