Meaning & use
GIGO
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Meanings
abbreviationcomputingtechnical
The principle that a computer or system produces poor results when the data or instructions it receives are poor.
Grammar: Used as an uncountable idea, so it takes a singular verb: GIGO is a useful warning.
Patterns
- GIGO applies to something
- the GIGO principle
- it is a case of GIGO
The report was full of errors because the survey questions were badly written — a clear case of GIGO.
Our manager keeps reminding the team that GIGO applies to every model we build.
If you train the program on unreliable records, don't be surprised by the results; that's GIGO.
abbreviationinformalfigurative
Used more broadly to say that weak or careless input of any kind leads to weak or careless results.
Grammar: Often stands alone as a comment after a bad outcome: Bad notes, bad essay — GIGO.
Patterns
- it is GIGO
- GIGO in action
- GIGO applies here too
He gave the translator a messy draft and got a messy translation back: GIGO in action.
The cooking class was a lesson in GIGO — cheap ingredients, disappointing dinner.
When the brief was vague, the whole advertising campaign suffered. GIGO applies here too.
Common combinations
- the GIGO principle
- The GIGO principle explains why clean data matters so much.
- a case of GIGO
- The broken sales figures were a case of GIGO.
- GIGO applies to something
- GIGO applies to machine learning as much as to spreadsheets.
- GIGO in action
- We saw GIGO in action when the faulty sensor ruined the experiment.
- be a GIGO situation
- Without proper training for staff, it's a GIGO situation.
Synonyms and how they differ
- rubbish in, rubbish out
- The British spoken version of the same idea; it is less formal and not used as a technical term.
- bad input, bad output
- A plain descriptive phrase rather than a fixed name; it fits general writing but is not the standard computing term.
Commonly confused: GIGO or giga?
GIGO vs giga
Giga is a prefix meaning a billion, as in gigabyte; GIGO is a separate abbreviation about poor-quality input.
Practice
Which sentence uses GIGO correctly?
Choose one answer.
GIGO names the idea that bad input gives bad results, so it fits the sentence about mistaken entries. Option A treats it as a piece of hardware, option C as a way of speaking, and option D as a verb; none of these uses exist.
Make it your own
Write a sentence using “GIGO”, then check it and compare it with the examples above.