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In this paper, we address the problem of deriving robust tests for single stuck-open faults in CMOS combinational circuits. We first examine the characteristics of the transition of the two patterns belonging to a two-pattern test. Then, a sufficient and necessary condition for a test to be robust is given. According to the given condition, we propose a new method to derive robust tests. Robustness verification of the derived tests is no longer required when using our approach.