Garbage in, garbage out
Meaning
If flawed or incorrect input is provided to a system, the resulting output will inevitably be flawed or incorrect.
Origin
The phrase "Garbage In, Garbage Out," often shortened to GIGO, was born in the nascent world of computer science during the mid-20th century. As powerful mainframes began processing information at dizzying speeds, early pioneers quickly grasped a fundamental truth: even the most advanced machines couldn't perform miracles. Programmers and data analysts coined GIGO to warn that sophisticated algorithms could never magically transform flawed, incomplete, or incorrect input into accurate, useful output. It was a blunt, memorable reminder that if you feed junk into a digital system, you're guaranteed to get digital junk back out. This stark principle quickly transcended mere technical jargon, becoming a universal warning about any system where the quality of results hinges entirely on the quality of its starting materials.
Examples
- We've been trying to analyze the sales data for weeks, but the reports are still inaccurate—it's a classic case of garbage in, garbage out.
- Our project failed because we didn't properly research the user needs; remember, garbage in, garbage out, when starting a new venture.