We propose an algorithm for the analysis of robustness of timed automata, that is, the correctness of a model in the presence of small drifts of the clocks. The algorithm is an extension of the region-based algorithm of Puri and uses the idea of stable zones as introduced by Daws and Kordy. Similarly to the assumptions made by Puri, we restrict our analysis to the class of timed automata with closed guards, progress cycles, and bounded clocks. We have implemented the algorithm and applied it to several benchmark specifications. The algorithm is a depth-first search based on on-the-fly reachability using zones.
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