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The purpose of integration testing is to detect any inconsistencies between the software units that are integrated together (called assemblages) or between any of the assemblages and the hardware. System testing is a more limiting type of testing; it seeks to detect defects both within the "inter-assemblages" and also within the system as a whole.
System testing is performed on an integrated system to assess system fulfillment with its specified requirements. The basic testing initiates with functional testing which verifies the functionality of the system having qualities such as performance and sturdiness.
Integration testing (sometimes called Integration and Testing, abbreviated "I&T) is the activity of software testing in which individual software modules are combined and tested as a group. It occurs after unit testing and before system testing. Integration testing takes as its input modules that have been unit tested, groups them in larger aggregates, applies tests defined in an integration test plan to those aggregates, and delivers as its output the integrated system ready for system testing.