Evaluation of the quality of testing path delay faults under restricted input assumption

We show that in the case when the set of vector pairs that occur at the input of a combinatorial network in the system environment is restricted (as it is for most applications), the information on such restrictions should be accounted for when evaluating the quality of testing delay faults, especially if the test sequence "mimics" the normal operation, i.e. if only those vector pairs that may occur in normal operation are applied during testing.