QA glossary
What is third-party testing?
Third-party testing is software testing done by a team that did not write the code and does not report to the people who did. It is also called independent testing. Testers who did not build a feature question its assumptions, so they find the defects its authors cannot see.
An example from QA practice
A payments team ships a partial-refund feature and every unit test passes. An independent tester refunds half of an order that already had a discount code applied, and the refund is calculated on the price before the discount. Nobody on the development team tried that combination, because they built the flow around the cases they had in mind.
Levels of independence
Independence is a scale, not a switch. The lowest level is a developer testing their own code. Then comes a colleague on the same team, then a separate QA team inside the company, then an outside organisation. Each step up finds more of what the authors missed, because each tester shares fewer of their assumptions.
It does not replace developer testing. Unit tests still belong to the people who write the code. What an independent team adds is a second opinion on behaviour, plus a reporting line that keeps bugs from being argued away.
How BetterQA does it
We only test. We never build software, so we never sign off code we wrote: developers testing their own code are students grading their own exams. Our engineers log what they find in BugBoard, the defect tracker we built, where a screenshot or video becomes a structured bug report in minutes.
Related terms
The five ISTQB levels of tester independence, explained.