Chapter 2 – Testing Throughout the SDLC
System Integration Testing (SIT) – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
Testing performed to expose defects in the interactions between integrated systems or components at the system level.
In simple words
Once systems are combined, verify they talk to each other correctly.
Exam tip
SIT sits between system testing and acceptance testing.
Related terms
- Integration TestingAfter units work alone, you plug them together and check the seams — API calls, data hand-offs, contracts.
- System TestingEnd-to-end testing of the fully integrated product against its requirements, usually in a production-like environment.
- End-to-End Testing (E2E)Test the whole app the way a user would, through the real UI and back-end.
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