---
title: "Usability testing – from opinions to facts | Sweet Lava"
description: "In usability tests real users perform tasks while a researcher watches where they get stuck and why. See what a session uncovers in practice."
url: https://sweetlava.eu/en/glossary/usability-testing/
lang: en
alternate_pl: https://sweetlava.eu/pl/slownik/testy-uzytecznosci/
---

UX & product design 

# What is Usability testing?

Usability testing is a study in which real users perform tasks in a product (or prototype) while a researcher observes where they get stuck and why. The fastest route from team opinion to facts.

The mechanics are simple: the participant receives a realistic task ("find and order…"), thinks aloud, and the researcher observes without helping. Five such sessions typically expose most serious problems – one of UX research's best-documented findings.

Moderated tests (a researcher guides the session) yield deeper "whys"; unmoderated remote tests give scale at lower cost. You can test anything: a paper sketch, a prototype, a live product, a competitor's product.

**The most common mistake:** testing after launch, when changes are most expensive. Test prototypes – a fix in Figma costs hours; in production, weeks.

## Related services

- [ UX audits & UX/UI design → ](https://sweetlava.eu/en/services/ux-ui-ax/)

## Related terms

- [Heatmap](https://sweetlava.eu/en/glossary/heatmap/)
- [Prototype](https://sweetlava.eu/en/glossary/prototype/)
- [UX research](https://sweetlava.eu/en/glossary/ux-research/)

## Want to know where your product loses users?

A UX audit ends with a prioritised list of fixes, each with a rationale. Scope and quote within a few days.

[ Get in touch ](https://sweetlava.eu/en/contact/?source=glossary-usability-testing)