Black Box
The black box , more accurately known as the FDR (Flight Data Recorder) and CVR (Cockpit Voice Recorder), often provides the first glimpse through the window of tragedy to provide clues to the cause of an air disaster. Takes away the mystery of how this key instrument records information and will give readers unparalleled insight into the investigations of actual crashes. Linked to a TV series that will be shown by the Discovery Channel.

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An abstraction of a device or system in which only its externally visible behaviour is considered and not its implementation or "inner workings".

See also functional testing.