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Black Box Testing

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DEFINITION: A black box is any device whose workings are not understood by or accessible to its user. According to Edward Tenner, writing in The Washington Post, the first black box was a gun sight carried on World War II Flying Fortresses, with hidden components that corrected for environmental variables, such as wind speed. The crew probably didn't know how the device worked, but they knew it might be crucial  … 
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BLACK BOX TESTING DEFINITION (continued): …  to their survival. Nowadays, there are two types of black box carried on aircraft, which may be combined into a single device: a flight data recorder (FDR), which logs information such as speed and altitude, and a cockpit voice recorder (CVR), which logs all voice communication in the cockpit. These black boxes also carry beacons to help find the aircraft in a rescue situation.A sampling of other black boxes:In telecommunications, a black box is a resistor connected to a phone line that makes it impossible for the telephone company's equipment to detect when a call has been answered.In data mining, … 
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