The test is a key step in any process of development and shall to apply a series of tests or checks to an object (system / SW test - SUT). Always remembering that the test can only show the presence of errors, not their absence. In the RT system test it is not sufficient to check whether the SUT produces the correct outputs. It must also verify that the time taken to produce that output is as expected. Furthermore, the timing of these outputs may also depend on the timing of the inputs. In turn, the timing of future inputs applicable is determined from the outputs.