# Verification and validation

> "Verification" means checking whether an intended task has been carried out correctly, while "validation" means checking whether the objective was appropriate in the first place. For example, after deciding to use the arithmetic mean to calculate average income among Koreans, checking whether it was calculated correctly is verification. Checking whether the arithmetic mean is the right measure for average income is validation.

"Verification" means checking whether an intended task has been carried out correctly, while "validation" means checking whether the objective was appropriate in the first place. For example, after deciding to use the <arithmetic mean> to calculate average income among Koreans, checking whether it was calculated correctly is verification. Checking whether the arithmetic mean is the right measure for average income is validation.

Verification without validation means doing the wrong thing correctly.