Also known as unit or component testing phase, module testing is concerned with the testing of the smallest piece of software for which a separate specification exists.

Both IEEE 1008 and BS 7925-2 detail the test process required at this level, while BS 7925-2 also defines the test case design techniques which can be applied.

BS 7925-2, which was produced by the Testing Standards Working Party, was published in 1998 by BSI.