European Finance Observatory

Concept · Brief definitionRelevant to you

System integration testing (SIT)

System integration testing checks that separate systems and interfaces work together correctly, for example that a trade booked in one system reaches settlement and the ledger with the right values. It comes after unit testing and before user acceptance testing.

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This is a brief definition. A full explanation with a worked example is being written.

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Updated 31 Oct 2026.