Chapter 2 – Testing Throughout the SDLC
Integration Testing – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
Testing performed to expose defects in the interfaces and interactions between integrated components or systems.
In simple words
After units work alone, you plug them together and check the seams — API calls, data hand-offs, contracts.
Exam tip
CTFL v4.0 distinguishes component integration testing (within a system) from system integration testing (between systems).
Related terms
- Component TestingTesting the smallest testable pieces of code (a function, class, or module) in isolation, usually by developers.
- System TestingEnd-to-end testing of the fully integrated product against its requirements, usually in a production-like environment.
- API TestingTesting at the service boundary — sending requests to endpoints and asserting responses — without a UI.
Practice this term in the ISTQB Mock Test
40 CTFL v4.0 questions, 60-minute timer, instant scoring and chapter-wise breakdown.
Practice in Mock Test