# Verification and validation: how we check every delivery

# Verification and validation: how we check every delivery

Lincoln Alves · 2026-09-16

Done is defined at the start. At the end, we check against it, item by item.

A delivery is done when it matches what we agreed, not when the team stops working on it. So we write down what done means before the first line of code.

### At the start

 Scope, metrics and acceptance criteria go into one document the client signs off. Every item has a way to be checked: a test, a number, a screen.

### At the end

- Automated tests and accessibility scans on every change.
- A review of the delivery against the document, item by item.
- A short report of what passed, what changed and why.

> If it cannot be checked, it is not a requirement yet.

## More from the journal

- [Journal](/blog.md)

- [Machine speed, human signature: how we use AI without losing accountability](/blog/machine-speed-human-signature.md): AI drafts a lot in our pipeline. People still decide. Here is where AI sits in each stage, and where it does not.
- [TYPO3, WordPress or headless? Choosing a CMS for a multilingual site](/blog/typo3-wordpress-or-headless.md): Three questions decide it: who edits, how many languages, and what your IT allows.
- [GEO: writing for people and for AI answers](/blog/geo-writing-for-people-and-for-ai-answers.md): Search is no longer only a list of links. What changes in content and code when answers come from AI.
- [React Native in 2026: when one code base is enough](/blog/react-native-in-2026-when-one-code-base-is-enough.md): Where cross-platform wins, and the cases where we still write native modules.
- [Verification and validation: how we check every delivery](/blog/verification-and-validation-how-we-check-every-delivery.md): Done is defined at the start. At the end, we check against it, item by item.
- [Working from Curitiba with teams in Vienna and New York](/blog/working-from-curitiba-with-teams-in-vienna-and-new-york.md): Hours that overlap, rituals that travel, and what we learned about working across time zones.
- [Our origin: from code partner for agencies to AI-first engineering](/blog/our-origin.md): Coopers started in 2013 as the team agencies called when they needed code. What we kept from those years, and what changed.
- [How we build a website, step by step](/blog/how-we-build-a-website.md): Five steps from the first question to the first weeks after launch, and what you see and approve at each one.
- [Monthly maintenance: why a website is never finished](/blog/monthly-maintenance.md): A site nobody looks after gets slower, less secure and harder to find. What monthly maintenance covers, and how we run it.

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