How do you define man made disaster and what should be the hospital planning to meet mass casualties?

disaster are either natural or man made – terrorist attacks, plain or train accidents . Hospital emergencies are usually not geared to receive mass casualties, what should be the hospital planning to meet such a situation?

Have allot of staff and equipment on standby, and rooms which are free and can be used.
Also, sort out the patients.

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Failed: Person can’t be saved and time spent on this person would be wasted and indirectly cause more death.

Priority: Person can be saved but needs help quickly, or he/she will die.

Critical: Person does not need immediate attention, but does need aid and fast.

Non-critical: Needs a bandages and painkillers.