Root Cause Analysis: The 5 'Why's
  Camila Brizolaにより
     
    1. Problem:
    2. Why?
2.1. Question:
2.2. Answer:
    3. Why?
3.1. Question:
3.2. Answer:
    4. Counter-Measure:
    5. Why?
5.1. Question:
5.2. Answer:
    6. Why?
6.1. Question:
6.2. Answer:
    7. Why?
7.1. Question:
7.2. Answer: