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The challenging discipline of designing systems, devices, or life plans that are intended to function correctly only a certain percentage of the time. It's the art of building a bridge that might hold, a toaster that might not burn your house down, or a relationship that will probably work out. It's the field responsible for "this computer has a low probability of crashing" and "this plan has a high probability of success." In practice, it's the engineering behind everything that mostly works, most of the time.
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