The test coverage associated with a signature test is explicitly enumerated by the Analyst and does not change as the design matures or when the test is inheritedinto higher design levels. Interference only exists when the test symmetry is set to "Signature Identifies Operation" (the default setting). On the test's Interpretation panel, the Analyst can disable creation interferenceand observation interference, but not propagation interference (if it is desired that all interference be disabled, this can be done by setting the test's symmety to "Signature Identifies Operation / Malfunction").
Note: Hierarchical use of Signature tests require that the analyst choose the upper level observation point when the test his used hierarchically
