Jian-Min-Huang
commented
4 years ago - P0. Your Mum dying, kids are in trouble, a guy just had a heart attack in the shop and now nothing else matters. This P0 just block everything else and stops all thought of scheduling.
- P1. The system is down and is needed now
- P2. Some important function really needed now is not working but we can operate
- P3. Some important function is required soon but it can wait
- P4. A non-urgent question that can wait.