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I would like this to result in some quest like goal. So say that you break your leg, get your liver divieded into two parts, or some other medical emergency. There would be the first aid (make a splint, crutches, bandaids, etc). Then there might be second aid, such as cauterization, sewing the wound (I would like to see this added), bone setting, and other more sever medical attencion. Then finally there would be final or third aid. In which case you drag, limp, drive to a hospital. After battleing through the regular hospital zombies, you finally arrive at the ER or at the operating room of the hospital. There, with enough medical, computer and mecanical skills, you can get the old medical robots powered up again (there are cop bots, why not med bots?). This is a good flow because it is not too easy to just walk off a broken leg, and it is not too easy to repair it either. The tiers are useful for maintaining some mobility while still injured, but still having an effect. And since I am no good at balance, I would leave that to the public to decied the power of things.
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