After a test plan has been developed, system testing begins by testing program modules separately, followed by testing "bundled" modules as a unit. A program module may function perfectly in isolation but fail when interfaced with other modules. The approach is to test each entity with successively larger ones, up to the system test level.
System testing consists of the following steps:
1. Program(s) testing.
2. String testing.
3. System testing.
4. System documentation.
5. User acceptance testing.
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