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Garbage in, garbage out
Garbage in, garbage out (GIGO) in the field of computer science or information and communications technology refers to the fact that computers, since they operate by logical processes, will unquestioningly process unintended, even nonsensical, input data ("garbage in") and produce undesired, often nonsensical, output ("garbage out"). The principle applies to other fields as well.
==History==
It was popular in the early days of computing, but applies even more today, when powerful computers can produce large amounts of erroneous information in a short time. The first use of the term has been dated to a 1 April 1963 syndicated newspaper article about the first stages of computerization of the US Internal Revenue Service. The term was brought to prominence as a teaching mantra by George Fuechsel, an IBM 305 RAMAC technician/instructor in New York. Early programmers were required to test virtually each program step and cautioned not to expect that the resulting program would "do the right thing" when given imperfect input. The underlying principle was noted by the inventor of the first programmable computing device design:
The term may have derived from FIFO and LIFO accounting, and last-in, first-out (LIFO), first-in, first-out (FIFO) in computing.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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