For original paper see ibid., vol. 11, pp. 87-101 (Jan. 1992). The robust nature of the gate delay fault tests corresponding to Theorems 7 and 8 in the original paper is clarified and described in greater detail. There are two types of robust tests for gate delay faults: a hazard-free robust test for a gate delay fault on a gate g is a robust test where only paths that pass through g are event sensitized; a general robust test for a gate delay fault on a gate g is a robust test where paths that do not pass through g can be event sensitized. The two types of robust tests are illustrated.
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