There is rarely ever a single root cause of a problem. There is rarely ever a single symptom (effect) of a problem. Causality is not a chain, but a network. There may be faster and cheaper places to intervene than the root cause.
- **Why** do I think the root cause is the best place to fix this problem?
- **Why** do I think I should only intervene at a single location?
- **Why** do I think the best intervention point will remain static?
- **What** other important causes and effects are entering and exiting my causal chain?