Integration Testing – Terms and Definitions (ISTQB)

Integration: The process of combining components or systems into larger assemblies.

Integration Testing: Testing performed to expose defects in the interfaces and in the interactions between integrated components or systems. See also component integration testing, system integration testing.

Component Integration Testing: Testing performed to expose defects in the interfaces and interaction between integrated components.

System Integration Testing: Testing the integration of systems and packages; testing interfaces to external organizations (e.g. Electronic Data Interchange, Internet).

The image shows the graphic breakdown of integration testing and possible approaches (see ISTQB)