As the components are constructed and tested, they are then linked together to check if they work with each other. It is a fact that two components that have passed all their tests, when connected to each other produce one new component full of faults. These tests can be done by specialists, or by the developers.
Integration Testing is not focused on what the components are doing but on how they communicate with each other, as specified in the "System Design". The "System Design" defines relationships between components.
The tests are organised to check all the interfaces, until all the components have been built and interfaced to each other producing the whole system.
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