Abstract
In this paper, we analyze the relation of faults between synthesized multilevel network and its collapsed two-level network. With the analysis, we also implement a program to select a proper set of faults in collapsed twolevel network from the synthesized mutilevel network. The tests for selected faults will detect all single stuck-at faults of the synthesized multilevel network. The number of generated tests is about 50% less than the number of twolevel complete test set.