The straightforward solution when shutdown is simple and low-cost is to shut down automatically. The problems arise with processes which, because of complexity, cost or other factors (e.g. an aircraft in the air) must be stabilized rather than shutdown. Should this be done manually or automatically? Manual shut down is usable if the process dynamics can be left for several minutes while the operator works out what is happening. For very fast failures, within a few seconds (e.g. pressurized water nuclear reactor rather than an aircraft), when there is no warning from prior changes so that on-line working storage would also be useless, then reliable automatic response is necessary, whatever the investment needed, and if this is not possible then the process should not be built if the costs of failure are unacceptable.
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