Editing Availability (section)

{{Short description|Term in reliability engineering}}
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In [[reliability engineering]], the term '''availability''' has the following meanings:

* The degree to which a [[system]], [[subsystem]] or equipment is in a specified operable and committable state at the start of a mission, when the mission is called for at an unknown, ''i.e.'' a random, time.
* The probability that an item will operate satisfactorily at a given point in time when used under stated conditions in an ideal support environment.

Normally [[high availability]] systems might be specified as 99.98%, 99.999% or 99.9996%. The converse, '''unavailability''', is 1 minus the availability.