> For the complete documentation index, see [llms.txt](https://isubasinghe.gitbook.io/isithas-wiki/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://isubasinghe.gitbook.io/isithas-wiki/software_engineering/quality_management/verification-vs-validation.md).

# Verification vs Validation

## Basic idea

*Verification* = "building the system **right**" — internal artefact-to-artefact checks (req → design → code). *Validation* = "building the **right** system" — checking against stakeholder needs.

## Key facts

* Verification: reviews, static analysis, type-checks. Internal.
* Validation: UAT, demos, beta. External.
* One without the other is not enough.